@article {39215,
	title = {Characterization of coke on spent hydroprocessing catalysts by optical microscopy},
	volume = {8},
	year = {1994},
	pages = {426-434},
	publisher = {Energy \& Fuels},
	author = {Munoz, V. A. and Ghorpadkar, S. V. and Gray, M. R.}
}
