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References:
[1] HÄGGKVIST R.: Problems. In: Combinatorics, Proceedings of the fifth Hungarian colloquium on combinatorics, Keszthely 28 June-3 July 1976, Bolyai János, Math. Soc. Budapest, 1978, 1203-1204.
[2] ZELINKA B.: On a problem of R. Häggkvist concerning edge-colouring of gгaphs. Časop. pěstov. mat. 103, 1978, 289-290. MR 0506558
[3] KУPOШ A. Г.: Oбщaя aлгeбpa. M., 1974.
[4] БEЛOУCOB B. Д.: Cиcтeмы квaзигpyпп c oбoбщeнными тoждecтвaми. УMH, т. XX., вып. 1 (121), 1965.
[5] ЗЫKOB A. A.: Teopия кoнeчныx гpaфoв И. Hoвocибиpcк, Hayкa, 1969.
[6] KAPГAПOЛOB M. И., MEPЗЛЯҞOB Ю. И.: Ocнoвы тeopии гpyпп. M., 1972.
[7] KУPOШ A. Г.: Teopия гpyпп M. 1967.
[8] AДЯH C. И.: Пpoблeмa Бepнcaйдa и тoждecтвa в гpyппax. M., 1975.
[9] NINČÁK J.: On a problem of R. Häggkvist concerning the edge colourings of bipartite graphs. Bulletins for applied mathematics, BAM 255/84 (XXXIV), Budapest, 1984, 117-126. Zbl 0583.05026
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