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2. Contractible edges and triangles in k-connected graphs;Kawarabayashi;J. Comb. Theory, Ser. B,2002
3. Subdivisions of K5 in graphs containing K2,3;Kawarabayashi;J. Comb. Theory, Ser. B,2015
4. Every minimal counterexample to the Dirac conjecture is 5-connected;Kelmans,1979
5. Independent paths and K5-subdivisions;Ma;J. Comb. Theory, Ser. B,2010