@article{ZNSL_1978_80_a7,
     author = {S. G. Mikhlin},
     title = {The constant factor in error estimates of the variational-difference approximation},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {125--166},
     publisher = {mathdoc},
     volume = {80},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_80_a7/}
}