1. Facultad de Ingeniería, Universidad Autónoma de Baja California, Blvd. B. Juárez s/n, Mexicali 21280, Mexico
2. Department of Agricultural Engineering and Forestry, University of Valladolid (UVA), Campus Universitario Duques de Soria, 42004 Soria, Spain
3. Department of Applied Physics, University of Valladolid (UVA), Campus Universitario Duques de Soria, 42004 Soria, Spain
4. Asociación Tierra Sin Males, 42004 Soria, Spain
5. Faculty of Education, University of Valladolid (UVA), Campus Universitario Duques de Soria, 42004 Soria, Spain