@article{RO_2019__53_5_1877_0,
     author = {Maghsoudlou, Hamidreza and Afshar-Nadjafi, Behrouz and Niaki, Seyed Taghi Akhavan},
     title = {Preemptive multi-skilled resource constrained project scheduling problem with hard/soft interval due dates},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {1877--1898},
     publisher = {EDP-Sciences},
     volume = {53},
     number = {5},
     year = {2019},
     doi = {10.1051/ro/2018103},
     mrnumber = {4021873},
     zbl = {1431.90068},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ro/2018103/}
}