Published in Boletin De La Sociedad De Biologia De Concepcion, in 1981, in volume 51, pages 161-165

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1981, in volume 51, pages 167-173

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1981, in volume 52, pages 51-66

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1981, in volume 52, pages 187-190

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1981, in volume 52, pages 191-194

Published in Boletin De La Sociedad De Biologia De Concepcion, in 1981, in volume 52, pages 195-201