@article {ekim2014polar,
	title = {Polar cographs},
	journal = {Discrete Applied Mathematics},
	volume = {171},
	number = {EPFL-ARTICLE-199582},
	year = {2014},
	pages = {158{\textendash}158},
	publisher = {Elsevier Science Bv},
	author = {Ekim, Tinaz and Mahadev, NVR and de Werra, Dominique}
}
