Authors: Tove Birkelund | Eckhart Hakansson

Published in Zitteliana, in 1982, in volume 10, pages 7-25

Created: 2017-11-06, modified: 2017-11-06

Authors: T Birkelund | B Thusu | J Vigran

Published in Palaeontology, in 1978, in volume 21, issue 1, pages 31-63

Created: 2016-04-23, modified: 2016-04-23