Template:Willumsen, Siemensma & Suhr-Jessen, 1987
- Willumsen, N.B.S., Siemensma, F. & Suhr-Jessen, P. 1987. A multinucleate amoeba, Parachaos zoochlorellae (Willumsen 1982) comb. nov., and a proposed division of the genus Chaos into the genera Chaos and Parachaos (Gymnamoebia, Amoebidae). Archiv für Protistenkunde 134(4): 303–313. DOI: 10.1016/S0003-9365(87)80002-7