@article{ZNSL_1971_23_a1,
     author = {Yu. K. Demjanovich},
     title = {On stability of projection methods},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {7--15},
     publisher = {mathdoc},
     volume = {23},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_23_a1/}
}