Published in Boletin De La Sociedad De Biologia De Concepcion, in 1994, in volume 65, pages 153-166

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1994, in volume 65, pages 187-190

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1994, in volume 65, pages 191-195