Published in Boletin De La Sociedad De Biologia De Concepcion, in 1992, in volume 63, pages 55-63

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1992, in volume 63, pages 147-150

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1992, in volume 63, pages 185-192