V. N. Temlyakov, “Sparse approximation and recovery by greedy algorithms in Banach spaces”, Forum Math. Sigma, 2 (2014), 0–26
Gustavo Garrigós, Eugenio Hernández, Timur Oikhberg, “Lebesgue-Type Inequalities for Quasi-greedy Bases”, Constr Approx, 38:3 (2013), 447