@article {KarimiVavasis,
	title = {IMRO: A Proximal Quasi-Newton Method for Solving $\ell_1$-Regularized Least Squares Problems},
	journal = {SIAM J. Optimiz},
	volume = {27},
	year = {2017},
	note = {Arxiv link: },
	pages = {583-615},
	author = {S. Karimi and S. Vavasis}
}