Reference
Čulik, K.: Zur Theorie der Graphen. Časopis Pro Pěstováni Matematiky83, 133–155 (1958).
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Written with the support of the National Science Foundation of the United States of America.
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Sabidussi, G. Graph multiplication. Math Z 72, 446–457 (1959). https://doi.org/10.1007/BF01162967
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DOI: https://doi.org/10.1007/BF01162967