Literature Cited
P. Ya. Grushko, “Some properties of semiplanar structures,” Vestn. Mosk. Gos. Univ., Ser. Mat. Mekh., No. 6, 3–11 (1974).
Additional information
Irkutsk State University. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 20, No. 6, pp. 1241–1248, November–December, 1979.
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Grushko, P.Y. Pseudostructures and several cases of their reductions to geometric structures. Sib Math J 20, 879–884 (1979). https://doi.org/10.1007/BF00970386
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DOI: https://doi.org/10.1007/BF00970386