@article{SM_2007_198_5_a4,
     author = {E. D. Livshits},
     title = {Optimality of the greedy algorithm for some function classes},
     journal = {Sbornik. Mathematics},
     pages = {691--709},
     publisher = {mathdoc},
     volume = {198},
     number = {5},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2007_198_5_a4/}
}