@article {ekim2008polar,
	title = {Polar cographs},
	journal = {Discrete Applied Mathematics},
	volume = {156},
	number = {10},
	year = {2008},
	pages = {1652{\textendash}1660},
	publisher = {North-Holland},
	author = {Ekim, Tinaz and Mahadev, Nadimpalli VR and de Werra, Dominique}
}
