@article{CRMATH_2011__349_21-22_1123_0,
     author = {Marcin Krzywkowski},
     title = {An upper bound on the 2-outer-independent domination number of a tree},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {1123--1125},
     publisher = {Elsevier},
     volume = {349},
     number = {21-22},
     year = {2011},
     doi = {10.1016/j.crma.2011.10.005},
     language = {en},
}