Reference
Andreas Rodolfo Leitner, Wilhelm Foissner (1997): Morphology and infraciliature of Microthorax pusillus ENGELMANN 1862 and Spathidium deforme KAHL 1928, two ciliates (Protozoa, Ciliophora) from activated sludge. – Linzer biologische Beiträge – 0029_1: 349 - 368.