@article{10_4064_sm161_3_1,
     author = {A. Kamont and V. N. Temlyakov},
     title = {Greedy approximation and the multivariate {Haar} system},
     journal = {Studia Mathematica},
     pages = {199--223},
     publisher = {mathdoc},
     volume = {161},
     number = {3},
     year = {2004},
     doi = {10.4064/sm161-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm161-3-1/}
}