A note on the 2-domination number of a tree

Jun Fujisawa, Adriana Hansberg, Takahiro Kubo, Akira Saito, Masahide Sugita, Lutz Volkmann. A note on the 2-domination number of a tree. Australasian J. Combinatorics, 40:265-268, 2008. [doi]

Abstract

Abstract is missing.