[1] Z. Majcher: On sequences representable by $\Gamma^-$-regular graphs. Graph Theory, tágow 1981, Lecture Notes in Maths. 1018 (Springer- Verlag, 1983), 131 - 138. MR 0730643

[2] Z. Majcher: Graphic matrices. (to appear). MR 0977896 | Zbl 0662.05045

[3] J. Plonka: On some regularities of graphs I. Čas. pěst. mat. 107 (1982), 231 - 240. MR 0673047 | Zbl 0505.05058