@article{VMUMM_2014_3_a0,
     author = {S. M. Lytkin},
     title = {Expansion over a system of shifts of pyramidal functions with a square base},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {3--7},
     publisher = {mathdoc},
     number = {3},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2014_3_a0/}
}