@article {30822,
	title = {Electron-spin resonance study of free-radicals in Athabasca asphaltene},
	volume = {56},
	year = {1977},
	pages = {249-256},
	publisher = {Fuel},
	author = {Nizuma, S. and Steele, C. T. and Gunning, H. E.. and et al}
}
