@article{CRMATH_2011__349_1-2_7_0,
     author = {Krzywkowski, Marcin},
     title = {A lower bound on the total outer-independent domination number of a tree},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {7--9},
     publisher = {Elsevier},
     volume = {349},
     number = {1-2},
     year = {2011},
     doi = {10.1016/j.crma.2010.11.021},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2010.11.021/}
}