original description(ofSchwagerina constans Shcherbovich, 1949 †)Rauzer-Chernousova, D. M.; Shcherbovich, S. F. (1949). Швагерины Европейской части СССР - Schwagerina from the European part of the USSR. <em>Труды ИГН Ан СССР - Reports Geological Institute Academy of sciences USSR.</em> 105: 61-117., available online athttp://www.ginras.ru/library/pdf/ign105_1949.pdf page(s): p. 89, pl. VII, figs. 5-7. [details] Available for editors [request]