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diff --git a/src/include/dset.h b/src/include/dset.h
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+++ b/src/include/dset.h
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+/**
+ *  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/>.
+ *
+ *  (c) Vincenzo Nicosia 2009-2017 -- <v.nicosia@qmul.ac.uk>
+ * 
+ *  This file is part of NetBunch, a package for complex network
+ *  analysis and modelling. For more information please visit:
+ *
+ *             http://www.complex-networks.net/
+ *
+ *  If you use this software, please add a reference to 
+ *
+ *               V. Latora, V. Nicosia, G. Russo             
+ *   "Complex Networks: Principles, Methods and Applications"
+ *              Cambridge University Press (2017) 
+ *                ISBN: 9781107103184
+ *
+ ***********************************************************************
+ */
+
+#ifndef __DSET_H__
+#define __DSET_H__
+
+
+typedef struct dset{
+  int rank;
+  struct dset *parent;
+  int id;
+} dset_elem_t;
+
+typedef dset_elem_t* dset_t;
+
+void dset_makeset(dset_t *ds);
+
+void dset_destroy(dset_t ds);
+
+dset_t dset_find(dset_t ds);
+
+void dset_union(dset_t s1, dset_t s2);
+
+void dset_union_opt(dset_t d1, dset_t s2);
+
+dset_t dset_find_opt(dset_t ds);
+
+void dset_makeset_id(dset_t *ds, int id);
+
+int dset_find_id(dset_t ds);
+
+int dset_find_id_opt(dset_t ds);
+
+
+
+#endif /* __DSET_H__ */