1. Department of Computer Science, University of Oviedo, Calvo Sotelo St. S/N, Oviedo, Asturias 33007, Spain
2. Research and Postgraduate Division, Orizaba Technology Institute, Av. Oriente, 9 No. 852 Col. Emiliano Zapata Orizaba, Veracruz 94320, Mexico
3. Escuela de Sistemas, Universidad Nacional de Colombia Calle, 59A No 63-20 – Núcleo El Volador, Medellin, Colombia