Published in Phegea, in 2001, in volume 29, issue 1, pages 33-34

Created: 2015-12-27, modified: 2015-12-27

Published in Phegea, in 1991, in volume 19, issue 4, pages 149-167

Created: 2016-08-14, modified: 2016-08-14

Published in Phegea, in 1989, in volume 17, issue 3, pages 105-106

Created: 2016-08-14, modified: 2016-08-14