中国科学院数学与系统科学研究院期刊网
AMS
Steiner Minimal Trees in Rectilinear and Octilinear Planes
Song Pu SHANG, Tong JING
Acta Mathematica Sinica . 2007, (9): 1577 -1586 .  DOI: 10.1007/s10114-005-0910-0