--- subgraph.hpp.orig	2014-06-27 13:49:35.000000000 +0400
+++ subgraph.hpp.copyctr.patched.reconst	2014-10-28 20:19:00.000000000 +0300
@@ -131,25 +131,22 @@
 
     // copy constructor
     subgraph(const subgraph& x)
-        : m_parent(x.m_parent), m_edge_counter(x.m_edge_counter)
+        : m_parent(x.m_parent), m_graph(x.m_graph), m_edge_counter(x.m_edge_counter)
         , m_global_vertex(x.m_global_vertex), m_global_edge(x.m_global_edge)
+        , m_local_vertex(x.m_local_vertex), m_local_edge(x.m_local_edge)
     {
-        if(x.is_root())
-        {
-         m_graph = x.m_graph;
-        }
         // Do a deep copy (recursive).
         // Only the root graph is copied, the subgraphs contain
         // only references to the global vertices they own.
         typename subgraph<Graph>::children_iterator i,i_end;
         boost::tie(i,i_end) = x.children();
         for(; i != i_end; ++i)
-        {         
+        {
          subgraph<Graph> child = this->create_subgraph();
          child = *i;
-         vertex_iterator vi,vi_end;   
+         vertex_iterator vi,vi_end;
          boost::tie(vi,vi_end) = vertices(*i);
-         for (;vi!=vi_end;++vi)  
+         for (;vi!=vi_end;++vi)
          {
           add_vertex(*vi,child);
          }