@article{TRSPY_2010_269_a20,
     author = {V. N. Temlyakov},
     title = {Greedy approximation of characteristic functions},
     journal = {Informatics and Automation},
     pages = {254--264},
     year = {2010},
     volume = {269},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2010_269_a20/}
}