Proper orientation number of triangle-free bridgeless outerplanar graphs

Jiangdong Ai, Stefanie Gerke, Gregory Z. Gutin, Yongtang Shi, Zhenyu Taoqiu. Proper orientation number of triangle-free bridgeless outerplanar graphs. Journal of Graph Theory, 95(2):256-266, 2020. [doi]

Abstract

Abstract is missing.