@article{ZNSL_1973_35_a10,
     author = {S. G. Mikhlin},
     title = {On the minimal number of the initial functions in the variational difference method},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {103--105},
     year = {1973},
     volume = {35},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1973_35_a10/}
}