A Constant-factor Approximation Algorithm for the <i>k</i> MST Problem (Extended Abstract).

Avrim Blum R. Ravi Santosh Vempala A Constant-factor Approximation Algorithm for the <i>k</i> MST Problem (Extended Abstract). 442-448 1996 conf/stoc/1996 STOC http://doi.acm.org/10.1145/237814.237992 db/conf/stoc/stoc1996.html#BlumRV96