title = {A constant-factor approximation algorithm for the geometric $k$-MST problem in the plane},
author = {Joseph S. B. Mitchell and Avrim Blum and Prasad Chalasani and Santosh Vempala},
journal = {SIAM J. Computing},
publisher = {SIAM},
volume = {28},
number = {3},
pages = {771--781},
year = {1999}}

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