Regular d-valent graphs of girth 6 and 2(d 2−d+1) verticesJournal of Combinatorial Theory - Tập 9 - Trang 420 - 1970
Judith Q. Longyear
For each d such that d-1 is prime, a d-valent graph of girth 6 having 2(d 2−d+1) vertices is exhibited. The method also gives the trivalent graph of girth 8 and 30 vertices.
A note on time-sharingJournal of Combinatorial Theory - Tập 5 - Trang 344-369 - 1968
Dan Chazan, Alan G. Konheim, Benjamin Weiss