diff --git a/Eigen/src/Core/Ref.h b/Eigen/src/Core/Ref.h
index ae414204e..6e94181f3 100644
--- a/Eigen/src/Core/Ref.h
+++ b/Eigen/src/Core/Ref.h
@@ -207,6 +207,7 @@ template<typename PlainObjectType, int Options, typename StrideType> class Ref
     EIGEN_DEVICE_FUNC inline Ref(const DenseBase<Derived>& expr,
                                  typename internal::enable_if<bool(Traits::template match<Derived>::MatchAtCompileTime),Derived>::type* = 0)
     #else
+    /** Implicit constructor from any dense expression */
     template<typename Derived>
     inline Ref(DenseBase<Derived>& expr)
     #endif
diff --git a/Eigen/src/SparseCore/SparseCompressedBase.h b/Eigen/src/SparseCore/SparseCompressedBase.h
index c223e4f42..f78d7c24d 100644
--- a/Eigen/src/SparseCore/SparseCompressedBase.h
+++ b/Eigen/src/SparseCore/SparseCompressedBase.h
@@ -22,6 +22,16 @@ struct traits<SparseCompressedBase<Derived> > : traits<Derived>
 
 } // end namespace internal
 
+/** \ingroup SparseCore_Module
+  * \class SparseCompressedBase
+  * \brief Common base class for sparse [compressed]-{row|column}-storage format.
+  *
+  * This class defines the common interface for all derived classes implementing the compressed sparse storage format, such as:
+  *  - SparseMatrix
+  *  - Ref<SparseMatrixType,Options>
+  *  - Map<SparseMatrixType>
+  *
+  */
 template<typename Derived>
 class SparseCompressedBase
   : public SparseMatrixBase<Derived>
diff --git a/Eigen/src/SparseCore/SparseMap.h b/Eigen/src/SparseCore/SparseMap.h
index 36c09ab0c..eb241c3e2 100644
--- a/Eigen/src/SparseCore/SparseMap.h
+++ b/Eigen/src/SparseCore/SparseMap.h
@@ -37,11 +37,15 @@ struct traits<Map<const SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, St
 };
 
 } // end namespace internal
-  
+
 template<typename Derived,
          int Level = internal::accessors_level<Derived>::has_write_access ? WriteAccessors : ReadOnlyAccessors
 > class SparseMapBase;
 
+/** \ingroup SparseCore_Module
+  * class SparseMapBase
+  * \brief Common base class for Map and Ref instance of sparse matrix and vector.
+  */
 template<typename Derived>
 class SparseMapBase<Derived,ReadOnlyAccessors>
   : public SparseCompressedBase<Derived>
@@ -71,22 +75,33 @@ class SparseMapBase<Derived,ReadOnlyAccessors>
 
   public:
 
+    /** \copydoc SparseMatrixBase::rows() */
     inline Index rows() const { return IsRowMajor ? m_outerSize : m_innerSize; }
+    /** \copydoc SparseMatrixBase::cols() */
     inline Index cols() const { return IsRowMajor ? m_innerSize : m_outerSize; }
+    /** \copydoc SparseMatrixBase::innerSize() */
     inline Index innerSize() const { return m_innerSize; }
+    /** \copydoc SparseMatrixBase::outerSize() */
     inline Index outerSize() const { return m_outerSize; }
+    /** \copydoc SparseCompressedBase::nonZeros */
     inline Index nonZeros() const { return m_zero_nnz[1]; }
     
+    /** \copydoc SparseCompressedBase::isCompressed */
     bool isCompressed() const { return m_innerNonZeros==0; }
 
     //----------------------------------------
     // direct access interface
+    /** \copydoc SparseMatrix::valuePtr */
     inline const Scalar* valuePtr() const { return m_values; }
+    /** \copydoc SparseMatrix::innerIndexPtr */
     inline const StorageIndex* innerIndexPtr() const { return m_innerIndices; }
+    /** \copydoc SparseMatrix::outerIndexPtr */
     inline const StorageIndex* outerIndexPtr() const { return m_outerIndex; }
+    /** \copydoc SparseMatrix::innerNonZeroPtr */
     inline const StorageIndex* innerNonZeroPtr() const { return m_innerNonZeros; }
     //----------------------------------------
 
+    /** \copydoc SparseMatrix::coeff */
     inline Scalar coeff(Index row, Index col) const
     {
       const Index outer = IsRowMajor ? row : col;
@@ -125,6 +140,10 @@ class SparseMapBase<Derived,ReadOnlyAccessors>
     inline SparseMapBase() {}
 };
 
+/** \ingroup SparseCore_Module
+  * class SparseMapBase
+  * \brief Common base class for writable Map and Ref instance of sparse matrix and vector.
+  */
 template<typename Derived>
 class SparseMapBase<Derived,WriteAccessors>
   : public SparseMapBase<Derived,ReadOnlyAccessors>
@@ -185,9 +204,23 @@ class SparseMapBase<Derived,WriteAccessors>
     inline SparseMapBase() {}
 };
 
+/** \ingroup SparseCore_Module
+  *
+  * \brief Specialization of class Map for SparseMatrix-like storage.
+  *
+  * \tparam SparseMatrixType the equivalent sparse matrix type of the referenced data, it must be a template instance of class SparseMatrix.
+  *
+  * \sa class Map, class SparseMatrix, class Ref<SparseMatrixType,Options>
+  */
+#ifndef EIGEN_PARSED_BY_DOXYGEN
 template<typename MatScalar, int MatOptions, typename MatIndex, int Options, typename StrideType>
 class Map<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType>
   : public SparseMapBase<Map<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType> >
+#else
+template<typename SparseMatrixType>
+class Map<SparseMatrixType>
+  : public SparseMapBase<Derived,WriteAccessors>
+#endif
 {
   public:
     typedef SparseMapBase<Map> Base;
@@ -196,6 +229,12 @@ class Map<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType>
 
   public:
 
+    /** Constructs a read-write Map to a sparse matrix of size \a rows x \a cols, containing \a nnz non-zero coefficients,
+      * stored as a sparse format as defined by the pointers \a outerIndexPtr, \a innerIndexPtr, and \a valuePtr.
+      * If the optional parameter \a innerNonZerosPtr is the null pointer, then a standard compressed format is assumed.
+      *
+      * More details on the expected storage schemes are given in the \ref TutorialSparse "manual pages".
+      */
     inline Map(Index rows, Index cols, Index nnz, StorageIndex* outerIndexPtr,
                StorageIndex* innerIndexPtr, Scalar* valuePtr, StorageIndex* innerNonZerosPtr = 0)
       : Base(rows, cols, nnz, outerIndexPtr, innerIndexPtr, valuePtr, innerNonZerosPtr)
diff --git a/Eigen/src/SparseCore/SparseRef.h b/Eigen/src/SparseCore/SparseRef.h
index 605ca42ba..a558230e7 100644
--- a/Eigen/src/SparseCore/SparseRef.h
+++ b/Eigen/src/SparseCore/SparseRef.h
@@ -108,20 +108,25 @@ protected:
 
 
 /** 
-  * \ingroup Sparse_Module
+  * \ingroup SparseCore_Module
   *
   * \brief A sparse matrix expression referencing an existing sparse expression
   *
-  * \tparam PlainObjectType the equivalent sparse matrix type of the referenced data
+  * \tparam SparseMatrixType the equivalent sparse matrix type of the referenced data, it must be a template instance of class SparseMatrix.
   * \tparam Options specifies whether the a standard compressed format is required \c Options is  \c #StandardCompressedFormat, or \c 0.
   *                The default is \c 0.
-  * \tparam StrideType Only used for dense Ref
   *
   * \sa class Ref
   */
+#ifndef EIGEN_PARSED_BY_DOXYGEN
 template<typename MatScalar, int MatOptions, typename MatIndex, int Options, typename StrideType>
 class Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType >
   : public internal::SparseRefBase<Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType > >
+#else
+template<typename SparseMatrixType, int Options>
+class Ref<SparseMatrixType, Options>
+  : public SparseMapBase<Derived,WriteAccessors> // yes, that's weird to use Derived here, but that works!
+#endif
 {
     typedef SparseMatrix<MatScalar,MatOptions,MatIndex> PlainObjectType;
     typedef internal::traits<Ref> Traits;
@@ -155,6 +160,7 @@ class Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType >
     template<typename Derived>
     inline Ref(const SparseCompressedBase<Derived>& expr)
     #else
+    /** Implicit constructor from any sparse expression (2D matrix or 1D vector) */
     template<typename Derived>
     inline Ref(SparseCompressedBase<Derived>& expr)
     #endif
@@ -225,19 +231,23 @@ class Ref<const SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType
 
 
 /**
-  * \ingroup Sparse_Module
+  * \ingroup SparseCore_Module
   *
   * \brief A sparse vector expression referencing an existing sparse vector expression
   *
-  * \tparam PlainObjectType the equivalent sparse matrix type of the referenced data
-  * \tparam Options Not used for SparseVector.
-  * \tparam StrideType Only used for dense Ref
+  * \tparam SparseVectorType the equivalent sparse vector type of the referenced data, it must be a template instance of class SparseVector.
   *
   * \sa class Ref
   */
+#ifndef EIGEN_PARSED_BY_DOXYGEN
 template<typename MatScalar, int MatOptions, typename MatIndex, int Options, typename StrideType>
 class Ref<SparseVector<MatScalar,MatOptions,MatIndex>, Options, StrideType >
   : public internal::SparseRefBase<Ref<SparseVector<MatScalar,MatOptions,MatIndex>, Options, StrideType > >
+#else
+template<typename SparseVectorType>
+class Ref<SparseVectorType>
+  : public SparseMapBase<Derived,WriteAccessors>
+#endif
 {
     typedef SparseVector<MatScalar,MatOptions,MatIndex> PlainObjectType;
     typedef internal::traits<Ref> Traits;
@@ -259,6 +269,7 @@ class Ref<SparseVector<MatScalar,MatOptions,MatIndex>, Options, StrideType >
     template<typename Derived>
     inline Ref(const SparseCompressedBase<Derived>& expr)
     #else
+    /** Implicit constructor from any 1D sparse vector expression */
     template<typename Derived>
     inline Ref(SparseCompressedBase<Derived>& expr)
     #endif