@article {van2006linear,
	title = {Linear grouping using orthogonal regression},
	journal = {Computational Statistics \& Data Analysis},
	volume = {50},
	number = {5},
	year = {2006},
	pages = {1287{\textendash}1312},
	publisher = {Elsevier},
	author = {Van Aelst, Stefan and Wang, Xiaogang Steven and Zamar, Ruben H and Zhu, Rong}
}
