%0 Journal Article %A Hiraki, Akira %A Nomura, Kazumasa %A Suzuki, Hiroshi %T Distance-regular graphs of valency 6 and $a_1=1$ %J Journal of Algebraic Combinatorics %D 2000 %P 101-134 %V 11 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/JAC_2000__11_2_a2/ %G en %F JAC_2000__11_2_a2