Ivanov & Hassan 1976. Penaeid shrimps (Decapoda, Penaeidae) collected off east Africa by the fishing vessel 'Van Gogh', 2. Deep-water shrimps of the genera Penaeopsis and Parapenaeus with description of Penaeopsis balssi sp. nov. Crustaceana, 31(1) 1976: 1-10,illust.[French summary.]