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diff --git a/src/Bitmap_cubical_complex/example/Bitmap_cubical_complex.cpp b/src/Bitmap_cubical_complex/example/Bitmap_cubical_complex.cpp
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+/*    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):       Pawel Dlotko
+ *
+ *    Copyright (C) 2015  INRIA Sophia-Saclay (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/>.
+ */
+
+// for persistence algorithm
+#include <gudhi/reader_utils.h>
+#include <gudhi/Bitmap_cubical_complex.h>
+#include <gudhi/Persistent_cohomology.h>
+
+#include <boost/program_options.hpp>
+
+// standard stuff
+#include <iostream>
+#include <sstream>
+
+using namespace Gudhi;
+using namespace Gudhi::persistent_cohomology;
+using namespace std;
+
+int main(int argc, char** argv) {
+  cout << "This program computes persistent homology, by using Bitmap_cubical_complex class, of cubical complexes "
+      "provided in text files in Perseus style (the only numbed in the first line is a dimension D of a cubical "
+      "complex. In the lines I between 2 and D+1 there are numbers of top dimensional cells in the direction I. Let N "
+      "denote product of the numbers in the lines between 2 and D. In the lines D+2 to D+2+N there are filtrations of "
+      "top dimensional cells. We assume that the cells are in the lexicographical order. See CubicalOneSphere.txt or "
+      "CubicalTwoSphere.txt for example." << endl;
+
+  int p = 2;
+  double min_persistence = 0;
+
+  if (argc != 2) {
+    cout << "Wrong number of parameters. Please provide the name of a file with a Perseus style cubical complex at the "
+        "input. The program will now terminate.\n";
+    return 1;
+  }
+
+  Bitmap_cubical_complex<double> b(argv[1]);
+
+
+  // Compute the persistence diagram of the complex
+  persistent_cohomology::Persistent_cohomology< Bitmap_cubical_complex<double>, Field_Zp > pcoh(b);
+  pcoh.init_coefficients(p);  // initializes the coefficient field for homology
+  pcoh.compute_persistent_cohomology(min_persistence);
+
+
+  stringstream ss;
+  ss << argv[1] << "_persistence";
+  std::ofstream out((char*) ss.str().c_str());
+  pcoh.output_diagram(out);
+  out.close();
+
+  return 0;
+}