@article {DoanTohVavasis,
	title = {A proximal point algorithm for sequential feature extraction applications},
	journal = {SIAM J. Sci. Comput.},
	year = {2013},
	note = {},
	pages = {A517-A540},
	author = {X. V. Doan and K.-C. Toh and S. Vavasis}
}