H. A. Nakrem, I. Nilsson, and B. T. Simonsen, “Moscovian (Carboniferous) microfossils (Bryozoa, Conodonta, and Fusulinida) from Novaya Zemlya, Arctic U.S.S.R.”, polar, vol. 9, no. 1, pp. 45-64, Jan. 1991.