1. Cycles of length 0 modulo 𝑘 in directed graphs;Alon, Noga;J. Combin. Theory Ser. B,1989
2. Every 7-regular digraph contains an even cycle;Friedland, Shmuel;J. Combin. Theory Ser. B,1989
3. Graph theory and crystal physics;Kasteleyn, P. W.,1967
4. Signsolvability revisited;Klee, Victor;Linear Algebra Appl.,1984
5. An extension of Kasteleyn’s method of enumerating the 1-factors of planar graphs;Little, Charles H. C.,1974