diff --git a/FunctionSpace/FunctionSpace.cpp b/FunctionSpace/FunctionSpace.cpp
index eab464d147954e049f1a7ca52df809f833b8048e..5e3aa7617897bda43d5888d823478d2f3ffc5e75 100644
--- a/FunctionSpace/FunctionSpace.cpp
+++ b/FunctionSpace/FunctionSpace.cpp
@@ -260,3 +260,28 @@ FunctionSpace::getKeys(const GroupOfElement& goe) const{
   // Return vector //
   return it->second;
 }
+
+void FunctionSpace::delKeys(const GroupOfElement& goe,
+                            std::set<Dof>& dof) const{
+  // Get Dofs //
+  const vector<vector<Dof> >& allDofs = getKeys(goe);
+
+  // Remove them from map //
+  const size_t size = allDofs.size();
+
+  set<Dof>::iterator end;
+  set<Dof>::iterator it;
+  size_t           nDof;
+
+  for(size_t i = 0; i < size; i++){
+    nDof = allDofs[i].size();
+
+    for(size_t j = 0; j < nDof; j++){
+      end = dof.end();
+      it  = dof.find(allDofs[i][j]);
+
+      if(it != end)
+        dof.erase(it);
+    }
+  }
+}
diff --git a/FunctionSpace/FunctionSpace.h b/FunctionSpace/FunctionSpace.h
index c7a42b7de324e293f7c41aca6e72d38b130f57dd..442bcb17aaad7db22645c29cd7a27d1c0d2f95ec 100644
--- a/FunctionSpace/FunctionSpace.h
+++ b/FunctionSpace/FunctionSpace.h
@@ -72,6 +72,8 @@ class FunctionSpace{
   void getKeys(const GroupOfElement& goe, std::set<Dof>& dof)  const;
   const std::vector<std::vector<Dof> >& getKeys(const GroupOfElement& goe)const;
 
+  void delKeys(const GroupOfElement& goe, std::set<Dof>& dof)  const;
+
  protected:
   FunctionSpace(void);
   void   build(const GroupOfElement& goe, std::string family);
@@ -136,8 +138,15 @@ class FunctionSpace{
    @param goe A GroupOfElement
    @return Returns a vector of vector of Dof such that:
    dof[i][j] is the jth Dof of the ith element of the given GroupOfElement
-*/
+   **
+
+   @fn void FunctionSpace::delKeys(const GroupOfElement&, std::set<Dof>&) const
+   @param goe A GroupOfElement
+   @param dof A set of Dof%s
 
+   Removes from the given set the Dof%s associated to the MElement%s
+   of the given GroupOfElement
+*/
 
 //////////////////////
 // Inline Functions //