5 1 10 Piskunov, N. Additional Author Vazquez, Carlos Additional Author Fernandez Victorio Additional Author Montaner y Simon Additional Author mixed material 8427402961 Barcelona Montaner y Simon 1973. Smith, Stanley A. Additional Author Charley, Randall I. Additional Author Dossey, John A. Additional Author Keedy, Mervin L. Additional Author Bittinger, Marvin L. Additional Author mixed material 9684442971 Mexico Addison Wesley Longman 1998. Lopez Cancio, Jose Antonio Additional Author Vera Castellano, Antonio Additional Author mixed material 8420539958 Madrid Prentice-Hall Hispanoamericana 2000. Merega, Herminia Additional Author mixed material 9504604935 Buenos Aires Santillana 1998 Merega, Herminia Additional Author Kaczor, Pablo J. Additional Author Schaposchnik, Ruth A. Additional Author Franco, Eleonora Additional Author Cicala, Rosa A. Additional Author Diaz, Bibiana H. Additional Author mixed material 9504605613 Buenos Aires Santillana 2001