Ivan Rival, Nejib Zaguia. Perpendicular orders. Discrete Mathematics, 137(1-3):303-313, 1995. [doi]
@article{RivalZ95,
title = {Perpendicular orders},
author = {Ivan Rival and Nejib Zaguia},
year = {1995},
doi = {10.1016/0012-365X(93)E0132-N},
url = {http://dx.doi.org/10.1016/0012-365X(93)E0132-N},
researchr = {https://researchr.org/publication/RivalZ95},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {137},
number = {1-3},
pages = {303-313},
}