@article {nair2018robust,
	title = {Robust adaptive gain higher order sliding mode observer based control-constrained nonlinear model predictive control for spacecraft formation flying},
	journal = {IEEE/CAA Journal of Automatica Sinica},
	volume = {5},
	number = {1},
	year = {2018},
	pages = {367{\textendash}381},
	publisher = {IEEE},
	author = {Nair, Ranjith Ravindranathan and Behera, Laxmidhar}
}
