@article{ISU_2009_9_1_a5,
     author = {P. A. Terekhin},
     title = {Projection description of bessel sequences},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {44--51},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2009_9_1_a5/}
}