Published in Boletin Soc Biol Concepcion, in 1974, in volume 48, pages 5-9

Published in Boletin Soc Biol Concepcion, in 1974, in volume 48, pages 23-31

Published in Boletin Soc Biol Concepcion, in 1974, in volume 48, pages 209-216

Published in Boletin Soc Biol Concepcion, in 1974, in volume 48, pages 217-229

Published in Boletin Soc Biol Concepcion, in 1974, in volume 48, pages 243-252

Published in Boletin Soc Biol Concepcion, in 1974, in volume 48, pages 365-383