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Additional information
Omsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 27, No. 1, pp. 123–131, January–February, 1986.
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Mednykh, A.D., Pozdnyakova, G.G. Number of nonequivalent coverings over a nonorientable compact surface. Sib Math J 27, 99–106 (1986). https://doi.org/10.1007/BF00969347
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DOI: https://doi.org/10.1007/BF00969347