@InProceedings{raso1991a,
	author = {Maria Raso and Alain Fournier},
	title = {A Piecewise Polynomial Approach to Shading Using Spectral Distributions},
	booktitle = {Proceedings of Graphics Interface~'91},
	year = {1991},
	month = {3--7~} # jun, address = {Calgary, AB, Canada},
	pages = {40--46} 
}