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REFERENCES
| V. A. Liskovets [ Liskovec ], Enumeration of nonisomorphic strongly connected automata. (Russian); Vesti Akad. Nauk. Belarus. SSR, Ser. Phys.-Mat., No. 3, 1971, pp. 26-30, esp. p. 30 (Math. Rev. 46 #5081).
V. A. Liskovets [ Liskovec ], A general enumeration scheme for labeled graphs. (Russian); Dokl. Akad. Nauk. Belarus. SSR, Vol. 21, No. 6 (1977), pp. 496-499 (Math. Rev. 58 #21797).
Zentralblatt 224.94053, 412.05052.
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