1. Cycle covers of cubic multigraphs;Alspach;Discrete Math.,1993
2. Graphs with the circuit cover property;Alspach;Tran. Amer. Math. Soc.,1994
3. Unsolved problems;Alspach,1985
4. M. Chan, A survey of the cycle double cover conjecture, Princeton University, 2009, Preprint.
5. On semiextensions and circuit double covers;Esteva;J. Combin. Theory Ser. B,2007