1 1 10 Zarate B, Carlos G Primary Author Kremling, Desider Primary Author Santos Granero, Fernando Primary Author Barclay Rey de Castro, Frederica Primary Author Restrepo, Marco Primary Author Jorge E. Uquillas Primary Author Escandel Garcia, Primary Author Duque, Andres Primary Author Chirif, Alberto Primary Author Grefa, Valerio Primary Author Serrano, Fernando Primary Author Muñoz, Luis Tony Primary Author Zulema Lehm Primary Author Mashinkiasi, Rafael Primary Author Alzate Angel, Beatriz Primary Author García, Joaquín Primary Author Bonilla Soria, Oscar Primary Author Haro, juan Francisco Primary Author Cuentas-Zabala, José Carlos Primary Author Paéz Cordero, Alexei Primary Author Benavides, Margarita Primary Author Urbina, Fernando Primary Author mixed material 9978823328 Quito ABYA-YALA 1993