Hans Havlicek. Projective ring lines and their generalisations. Electronic Notes in Discrete Mathematics, 40:151-155, 2013. [doi]
@article{Havlicek13,
title = {Projective ring lines and their generalisations},
author = {Hans Havlicek},
year = {2013},
doi = {10.1016/j.endm.2013.05.028},
url = {http://dx.doi.org/10.1016/j.endm.2013.05.028},
researchr = {https://researchr.org/publication/Havlicek13},
cites = {0},
citedby = {0},
journal = {Electronic Notes in Discrete Mathematics},
volume = {40},
pages = {151-155},
}