Published in Malacologia, in 1990, in volume 31, pages 363-370
Published in Malacologia, in 1990, in volume 32, issue 1, pages 131-145
Published in Malacologia, in 1990, in volume 32, issue 1, pages 147-154
Published in Malacologia, in 1990, in volume 32, issue 1, pages 195-202