价是3围长为2的交换弱距离正则有向图
岳孟田,李增提
Commutative Weakly Distance-regular Digraphs of Valency 3 and Girth 2
YUE Meng-tian,LI Zeng-ti
河北大学学报(自然科学版) . 2008, (4): 346 -348 .  DOI: 10.3969/j.issn.1000-1565.2008.04.003