Published in Boln Soc Biol Concepcion, in 1971, in volume 42, pages 41-48

Published in Boletin Soc Biol Concepcion, in 1971, in volume 42, pages 49-53

Published in Boletin Soc Biol Concepcion, in 1971, in volume 42, pages 55-57

Published in Boln Soc Biol Concepcion, in 1971, in volume 42, pages 67-70

Published in Boln Soc Biol Concepcion, in 1971, in volume 42, pages 97-122

Published in Boln Soc Biol Concepcion, in 1971, in volume 42, pages 381-395