@article{DMGT_2010_30_3_a1,
     author = {Cyman, Joanna},
     title = {Total outer-connected domination in trees},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {377--383},
     publisher = {mathdoc},
     volume = {30},
     number = {3},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2010_30_3_a1/}
}