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diff --git a/src/include/gen_pqueue.h b/src/include/gen_pqueue.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 __GEN_PQUEUE_H__
+#define __GEN_PQUEUE_H__
+
+#include "gen_heap.h"
+
+#define KEY_ERROR -1
+#define ID_ERROR  -2
+
+/*
+ * 
+ * This implementation of the priority queue is based on gen_heap, but
+ * requires some additional code to work, since we need to maintain an
+ * array of "handles", i.e. a mapping between elements and their
+ * current positions in the heap
+ *
+ */
+
+typedef struct{
+  int (*compare)(const void *e1, const void *e2); /* compare two elements (standard comparator) */
+  void* (*alloc_vector)(unsigned int N); /* */
+  void (*dealloc_vector)(void *v); /* */
+  void (*dealloc_elem)(void *e); /* deallocate an element */
+  void (*print_elem)(void *e); /* print an element */
+  int  (*get_id)(void *e); /* get the id associated to an element
+                              (used for handles management) */
+  void* (*get_key)(void *e);/* get the current key of element e */
+  void (*set_key)(void *e, void *k); /* set a new key to element e */
+  int (*compare_to_key)(void *e, void *key); /* compare a key with the one of element e */
+} gen_pqueue_func_t;
+
+
+
+typedef struct{
+  int N;
+  int last;
+  void **v;
+  gen_pqueue_func_t funs;
+  char qtype;
+  int *handles;
+} gen_pqueue_t;
+
+
+
+#define MIN_QUEUE 0x01
+#define MAX_QUEUE 0x02
+
+
+
+gen_pqueue_t * gen_pqueue_init(unsigned int N, char htype, gen_pqueue_func_t *funs);
+
+void gen_pqueue_insert(gen_pqueue_t *h, void *elem);
+
+int gen_pqueue_delete(gen_pqueue_t *h, void **val);
+
+void* gen_pqueue_peek(gen_pqueue_t *h);
+
+gen_pqueue_t* gen_pqueue_from_array(void **v, unsigned int N, unsigned int last, char htype, 
+                                gen_pqueue_func_t *funs);
+
+int gen_pqueue_change_key(gen_pqueue_t *q, unsigned int i, void *key);
+
+int gen_pqueue_force_key(gen_pqueue_t *q, unsigned int idx, void *key);
+
+void gen_pqueue_dump(gen_pqueue_t *h);
+
+void gen_pqueue_destroy(gen_pqueue_t *h);
+
+int gen_pqueue_get_handle(gen_pqueue_t *q, int id);
+
+void* gen_pqueue_get_key(gen_pqueue_t *q, int idx);
+
+
+
+
+#endif // __GEN_PQUEUE_H__