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1by Castro,Gustavo, Valbuena,Emiro, Sánchez,Edgar, Briñez,Wilfido, Vera,Henry, Leal,Merlis
Published 2008Digital revistaSCIELO -
2by Rodas-González,Argenis, Vergara-López,Juan, Arenas de Moreno,Lilia, Huerta-Leidenz,Nelson, Leal,Merlis, Pirela,Manuel Felipe
Published 2007Digital revistaSCIELO -
3by Uzcátegui-Bracho,Soján, Rodas-González,Argenis, Hennig,Karelys, Arenas de Moreno,Lilia, Leal,Merlis, Vergara-López,Juan, Jerez-Timaure,Nancy
Published 2008Digital revistaSCIELO