Published in Boletin De La Sociedad De Biologia De Concepcion, in 1982, in volume 53, pages 13-17

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1982, in volume 53, pages 19-23

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1982, in volume 53, pages 41-46

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1982, in volume 53, pages 71-77

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1982, in volume 53, pages 145-149