@article {drusvavawolk,
	title = {Extreme point inequalities and geometry of the rank sparsity ball},
	journal = {Mathematical Programming},
	volume = {152},
	number = {1},
	year = {2015},
	note = {Arxiv link: },
	month = {Aug},
	pages = {521{\textendash}544},
	abstract = {We investigate geometric features of the unit ball corresponding to the sum of the nuclear norm of a matrix and the \$\$l_1\$\$l1norm of its entries{\textendash}-a common penalty function encouraging joint low rank and high sparsity. As a byproduct of this effort, we develop a calculus (or algebra) of faces for general convex functions, yielding a simple and unified approach for deriving inequalities balancing the various features of the optimization problem at hand, at the extreme points of the solution set.},
	issn = {1436-4646},
	doi = {10.1007/s10107-014-0795-8},
	url = {https://doi.org/10.1007/s10107-014-0795-8},
	author = {Drusvyatskiy, D. and Vavasis, S. A. and Wolkowicz, H.}
}