@article{RO_2021__55_S1_S1355_0,
     author = {Shao, Zehui and Zhu, Enqiang and Xu, Jin and Vesel, Aleksander and Zhang, Xiujun},
     title = {Optimizing distance constraints frequency assignment with relaxation},
     journal = {RAIRO. Operations Research},
     pages = {S1355--S1367},
     year = {2021},
     publisher = {EDP-Sciences},
     volume = {55},
     doi = {10.1051/ro/2020043},
     mrnumber = {4223081},
     zbl = {1469.05059},
     language = {en},
     url = {https://www.numdam.org/articles/10.1051/ro/2020043/}
}