@thesis{thesis,
		author={Baki  Swita and Mudin  Simanihuruk and Saputra   Govi },
		title ={BATAS ATAS CHROMATIC NUMBER DARI KELAS GRAPH TERTENTU},
		year={2014},
		url={http://repository.unib.ac.id/9438/},
		abstract={Penentuan chromatic number }
		}