Jan Karel Lenstra, A. H. G. Rinnooy Kan. Complexity of Scheduling under Precedence Constraints. Operations Research, 26(1):22-35, 1978. [doi]
@article{LenstraK78,
title = {Complexity of Scheduling under Precedence Constraints},
author = {Jan Karel Lenstra and A. H. G. Rinnooy Kan},
year = {1978},
doi = {10.1287/opre.26.1.22},
url = {http://dx.doi.org/10.1287/opre.26.1.22},
researchr = {https://researchr.org/publication/LenstraK78},
cites = {0},
citedby = {0},
journal = {Operations Research},
volume = {26},
number = {1},
pages = {22-35},
}