Published in Malacologia, in 1999, in volume 41, pages 163-174

Published in Malacologia, in 1999, in volume 41, issue 1, pages 283-296

Published in Malacologia, in 1999, in volume 41, issue 2, pages 355-377

Published in Malacologia, in 1999, in volume 41, issue 2, pages 379-391