Ulrich Derigs. Rangzuordnungsprobleme. Math. Meth. of OR, 21(1):75-83, 1977. [doi]
@article{Derigs77,
title = {Rangzuordnungsprobleme},
author = {Ulrich Derigs},
year = {1977},
doi = {10.1007/BF01918458},
url = {http://dx.doi.org/10.1007/BF01918458},
researchr = {https://researchr.org/publication/Derigs77},
cites = {0},
citedby = {0},
journal = {Math. Meth. of OR},
volume = {21},
number = {1},
pages = {75-83},
}