%0 Journal Article %A Feng, Yan-Quan %A Kwak, Jin Ho %A Zhou, Chuixiang %T Constructing even radius tightly attached half-arc-transitive graphs of valency four %J Journal of Algebraic Combinatorics %D 2007 %P 431-451 %V 26 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/JAC_2007__26_4_a5/ %G en %F JAC_2007__26_4_a5