The class Steiner minimal tree problem: a lower bound and test problem generation.

Bo-Ting Yang Paul Gillard The class Steiner minimal tree problem: a lower bound and test problem generation. 193-211 2000 37 Acta Inf. 3 http://link.springer.de/link/service/journals/00236/bibs/0037003/00370193.htm db/journals/acta/acta37.html#YangG00