@article{DMGT_2009_29_3_a10,
     author = {Chellali, Mustapha and Haynes, Teresa and Randerath, Bert and Volkmann, Lutz},
     title = {Bounds on the global offensive k-alliance number in graphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {597--613},
     publisher = {mathdoc},
     volume = {29},
     number = {3},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2009_29_3_a10/}
}