Grafo de Gray (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Grafo de Gray" in Portuguese language version.

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Folkman, Jon (1967). «Regular line-symmetric graphs». Journal of Combinatorial Theory. 3. p. 533-535. doi:10.1016/S0021-9800(67)80069-3 .
Bouwer, I. Z. (1972). «An edge but not vertex transitive regular graphs». Journal of Combinatorial Theory, Series B. 12. pp. 32–40. doi:10.1016/0095-8956(72)90030-5 .
v, Dragan; Pisanski, Tomaž (2000). «The Gray graph revisited». Journal of Graph Theory. 35. pp. 1–7. doi:10.1002/1097-0118(200009)35:1<1::AID-JGT1>3.0.CO;2-7 .
Marušič, Dragan; Pisanski, Tomaž; Wilson, Steve (2005). «The genus of the Gray graph is 7». European Journal of Combinatorics. 26 (3–4). p. 377–385. doi:10.1016/j.ejc.2004.01.015 .