Reference

Martin Moosbrugger, Thomas Schwaha, Manfred Günther Walzl, Matthias Obst, Andrew N. Ostrovsky (2012): The placental analogue and the pattern of sexual reproduction in the cheilostome bryozoan Bicellariella ciliata (Gymnolaemata) – Frontiers in Zoology – 2012: 0001-29-0020.