@article{VMUMM_2003_4_a4,
     author = {M. G. Plotnikov},
     title = {Violation of the uniqueness for two-dimensional {Haar} series},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {20--24},
     publisher = {mathdoc},
     number = {4},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2003_4_a4/}
}