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2. Cycles of length 0 modulo 3 in graphs;Barefoot;Sixth Internat. Conf. on the Theory and Applications of Graphs,1988
3. Graphs and Digraphs;Chartrand,1986
4. Cycles modulo k;Bollobas;Bull. London Math. Soc.,1977
5. Large cycles in graphs;Bondy;Discrete Math.,1971