@article{RO_2021__55_2_495_0,
     author = {Ouatiki, Saliha and Bouzefrane, Mohamed},
     title = {A lower bound on the global powerful alliance number in trees},
     journal = {RAIRO. Operations Research},
     pages = {495--503},
     year = {2021},
     publisher = {EDP-Sciences},
     volume = {55},
     number = {2},
     doi = {10.1051/ro/2021028},
     mrnumber = {4238789},
     zbl = {1468.05216},
     language = {en},
     url = {https://www.numdam.org/articles/10.1051/ro/2021028/}
}