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diff --git a/src/include/iltree.h b/src/include/iltree.h
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+++ b/src/include/iltree.h
@@ -0,0 +1,93 @@
+/**
+ *  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 __ILTREE_H__
+#define __ILTREE_H__
+
+
+typedef struct node{
+  void* info;
+  struct node* left;
+  struct node* right;
+} node_t;
+
+typedef struct{
+  void* (*alloc)();
+  void (*dealloc)(void*);
+  void (*copy)(void *src, void *dst);
+  int (*compare)(void*, void*);
+  void (*print)(void*, void*);
+  void *fileout;
+} ilfunc_t;
+
+
+typedef struct {
+  node_t* root;
+  ilfunc_t funs;
+} iltree_struct_t;
+
+
+
+typedef iltree_struct_t* iltree_t;
+
+
+void iltree_set_funs(iltree_t, ilfunc_t *);
+
+void iltree_destroy(iltree_t);
+
+void iltree_empty(iltree_t);
+
+void iltree_insert(iltree_t, void*);
+
+void* iltree_lookup(iltree_t, void*);
+
+void iltree_view_pre(iltree_t);
+
+iltree_t iltree_create(iltree_t);
+
+void iltree_empty_cache(iltree_t);
+
+void iltree_map(iltree_t, void (*func)(void*));
+
+void iltree_map_args(iltree_t, void (*func)(void*, void*), void*);
+
+void* iltree_get_fileout(iltree_t t);
+
+void iltree_set_fileout(iltree_t t, void *f);
+
+void* iltree_getmin(iltree_t t);
+
+void* iltree_getmax(iltree_t t);
+
+
+
+#endif /* __ILTREE_H__*/