| Authors(s) | Witte, U. and D. Barthel |
| Year | 1994 |
| Title | Reproductive cycle and oogenesis of Halichondria panicea (Pallas) in Kiel Bight: 297-305. In: R.W.M. van Soest, Th. M.G. van Kempen and J.C. Braekman, eds. Sponges in time and space. Balkema, Rotterdam: i-xviii,1-515 |