@article{RO_2018__52_4-5_1245_0,
     author = {Eydi, Alireza and Mohebi, Javad},
     title = {Modeling and solution of maximal covering problem considering gradual coverage with variable radius over multi-periods},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {1245--1260},
     publisher = {EDP-Sciences},
     volume = {52},
     number = {4-5},
     year = {2018},
     doi = {10.1051/ro/2018026},
     zbl = {1411.90199},
     mrnumber = {3884157},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/ro/2018026/}
}