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diff --git a/include/gudhi/Skeleton_blocker/iterators/Skeleton_blockers_vertices_iterators.h b/include/gudhi/Skeleton_blocker/iterators/Skeleton_blockers_vertices_iterators.h
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+++ b/include/gudhi/Skeleton_blocker/iterators/Skeleton_blockers_vertices_iterators.h
@@ -0,0 +1,174 @@
+/*    This file is part of the Gudhi Library. The Gudhi library
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++
+ *    library for computational topology.
+ *
+ *    Author(s):       David Salinas
+ *
+ *    Copyright (C) 2014  INRIA Sophia Antipolis-Mediterranee (France)
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef SKELETON_BLOCKER_ITERATORS_SKELETON_BLOCKERS_VERTICES_ITERATORS_H_
+#define SKELETON_BLOCKER_ITERATORS_SKELETON_BLOCKERS_VERTICES_ITERATORS_H_
+
+#include <boost/iterator/iterator_facade.hpp>
+
+#include <utility>  // for pair<>
+
+namespace Gudhi {
+
+namespace skeleton_blocker {
+
+/**
+ *@brief Iterator on the vertices of a simplicial complex
+ *@remark The increment operator go to the next active vertex.
+ *@remark Incrementation increases Vertex_handle.
+ */
+template<typename SkeletonBlockerComplex>
+class Vertex_iterator : public boost::iterator_facade< Vertex_iterator <SkeletonBlockerComplex>
+, typename SkeletonBlockerComplex::Vertex_handle const
+, boost::forward_traversal_tag
+, typename SkeletonBlockerComplex::Vertex_handle const> {
+  friend class boost::iterator_core_access;
+
+  typedef typename SkeletonBlockerComplex::boost_vertex_iterator boost_vertex_iterator;
+  typedef typename SkeletonBlockerComplex::Vertex_handle Vertex_handle;
+ private:
+  const SkeletonBlockerComplex* complex;
+  std::pair<boost_vertex_iterator, boost_vertex_iterator> vertexIterator;
+
+
+ public:
+  Vertex_iterator() : complex(NULL) { }
+
+  Vertex_iterator(const SkeletonBlockerComplex* complex_) :
+      complex(complex_),
+      vertexIterator(vertices(complex_->skeleton)) {
+    if (!finished() && !is_active()) {
+      goto_next_valid();
+    }
+  }
+
+  /**
+   * return an iterator to the end.
+   */
+  Vertex_iterator(const SkeletonBlockerComplex* complex_, int end) :
+      complex(complex_), vertexIterator(vertices(complex_->skeleton)) {
+    vertexIterator.first = vertexIterator.second;
+  }
+
+ public:
+  void increment() {
+    goto_next_valid();
+  }
+
+  Vertex_handle dereference() const {
+    return (Vertex_handle(*(vertexIterator.first)));
+  }
+
+  bool equal(const Vertex_iterator& other) const {
+    return vertexIterator == other.vertexIterator && complex == other.complex;
+  }
+
+  bool operator<(const Vertex_iterator& other) const {
+    return dereference() < other.dereference();
+  }
+
+ private:
+  bool finished() const {
+    return vertexIterator.first == vertexIterator.second;
+  }
+
+  void goto_next_valid() {
+    ++vertexIterator.first;
+    if (!finished() && !is_active()) {
+      goto_next_valid();
+    }
+  }
+
+  bool is_active() const {
+    return ((*complex)[Vertex_handle(*vertexIterator.first)]).is_active();
+  }
+};
+
+template<typename SkeletonBlockerComplex>
+class Neighbors_vertices_iterator: public boost::iterator_facade < Neighbors_vertices_iterator<SkeletonBlockerComplex>
+, typename SkeletonBlockerComplex::Vertex_handle const
+, boost::forward_traversal_tag
+, typename SkeletonBlockerComplex::Vertex_handle const> {
+  friend class boost::iterator_core_access;
+
+  typedef SkeletonBlockerComplex Complex;
+  typedef typename Complex::boost_adjacency_iterator boost_adjacency_iterator;
+  typedef typename Complex::Vertex_handle Vertex_handle;
+  typedef typename Complex::Edge_handle Edge_handle;
+
+ private:
+  const Complex* complex;
+  Vertex_handle v;
+
+  boost_adjacency_iterator current_;
+  boost_adjacency_iterator end_;
+
+ public:
+  // boost_adjacency_iterator ai, ai_end;
+  // for (tie(ai, ai_end) = adjacent_vertices(v.vertex, skeleton); ai != ai_end; ++ai) {
+
+  Neighbors_vertices_iterator() : complex(NULL) { }
+
+  Neighbors_vertices_iterator(const Complex* complex_, Vertex_handle v_) :
+      complex(complex_),
+      v(v_) {
+    tie(current_, end_) = adjacent_vertices(v.vertex, complex->skeleton);
+  }
+
+  /**
+   * returns an iterator to the end
+   */
+  Neighbors_vertices_iterator(const Complex* complex_, Vertex_handle v_, int end) :
+      complex(complex_),
+      v(v_) {
+    tie(current_, end_) = adjacent_vertices(v.vertex, complex->skeleton);
+    set_end();
+  }
+
+  void increment() {
+    if (current_ != end_)
+      ++current_;
+  }
+
+  Vertex_handle dereference() const {
+    return (Vertex_handle(*current_));
+  }
+
+  bool equal(const Neighbors_vertices_iterator& other) const {
+    return (complex == other.complex) && (v == other.v) && (current_ == other.current_) && (end_ == other.end_);
+  }
+
+ private:
+  // todo remove this ugly hack
+  void set_end() {
+    current_ = end_;
+  }
+};
+
+}  // namespace skeleton_blocker
+
+namespace skbl = skeleton_blocker;
+
+}  // namespace Gudhi
+
+#endif  // SKELETON_BLOCKER_ITERATORS_SKELETON_BLOCKERS_VERTICES_ITERATORS_H_
+
+