Mathew C. Francis, Pavol Hell, Juraj Stacho. Blocking Quadruple: A New Obstruction to Circular-Arc Graphs. SIAM J. Discrete Math., 28(2):631-655, 2014. [doi]
@article{FrancisHS14,
title = {Blocking Quadruple: A New Obstruction to Circular-Arc Graphs},
author = {Mathew C. Francis and Pavol Hell and Juraj Stacho},
year = {2014},
doi = {10.1137/13091717X},
url = {http://dx.doi.org/10.1137/13091717X},
researchr = {https://researchr.org/publication/FrancisHS14},
cites = {0},
citedby = {0},
journal = {SIAM J. Discrete Math.},
volume = {28},
number = {2},
pages = {631-655},
}