@book{89807,
	author = {Beth, Evert Willem and Piaget, Jean,},
	title = {Epistemología matemática y psicología},
	publisher = {Editorial Crítica, Grupo Editorial Grijalbo},
	year = {1980.},
	address = {Barcelona},
	edition = {2a. ed.},
	note = {Translation of : Epistemologie mathematique et psychologie, essai sur les relations entre la logique formelle et la pensee reelle.}
}