Bernhard Ganter, Gerhart Häfner, Werner Poguntke. On linear extensions of ordered sets with a symmetry. Discrete Mathematics, 63(2-3):153-156, 1987. [doi]
@article{GanterHP87,
title = {On linear extensions of ordered sets with a symmetry},
author = {Bernhard Ganter and Gerhart Häfner and Werner Poguntke},
year = {1987},
doi = {10.1016/0012-365X(87)90005-7},
url = {http://dx.doi.org/10.1016/0012-365X(87)90005-7},
researchr = {https://researchr.org/publication/GanterHP87},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {63},
number = {2-3},
pages = {153-156},
}