Template:Nichols et al., 1991
- Nichols, H.W., Nichols, M.S., Thomas, C.M., Deacon, J.S. & Veith, M. 1991. A new Sphaerellocystis (Palmellopsidaceae, Tetrasporales) from Prairie soils. Archiv für Protistenkunde 140(2–3): 157–170. DOI: 10.1016/S0003-9365(11)80184-3