Ismael R. de Farias Jr., Ellis L. Johnson, George L. Nemhauser. A generalized assignment problem with special ordered sets: a polyhedral approach. Math. Program., 89(1):187-203, 2000. [doi]
@article{FariasJN00,
title = {A generalized assignment problem with special ordered sets: a polyhedral approach},
author = {Ismael R. de Farias Jr. and Ellis L. Johnson and George L. Nemhauser},
year = {2000},
doi = {10.1007/PL00011392},
url = {http://dx.doi.org/10.1007/PL00011392},
researchr = {https://researchr.org/publication/FariasJN00},
cites = {0},
citedby = {0},
journal = {Math. Program.},
volume = {89},
number = {1},
pages = {187-203},
}