@article {skarpetis2000command,
	title = {Command following and disturbance rejection for drillstring systems},
	journal = {System and Control: Theory and Applications, Electrical and Computer Eng. Series, World Scientific and Eng. Society Press},
	year = {2000},
	pages = {203{\textendash}204},
	author = {Skarpetis, MG and Koumboulis, FN and Ladopoulos, T}
}
