@article{IVM_2008_5_a3,
     author = {M. G. Grigorian},
     title = {On the strengthened $L^1$-greedy property of the {Walsh} system},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {26--37},
     publisher = {mathdoc},
     number = {5},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2008_5_a3/}
}