@article{ZNSL_1979_90_a6,
     author = {S. G. Mikhlin},
     title = {On the minimal constant of continuation of functions of {Sobolev} classes},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {150--185},
     publisher = {mathdoc},
     volume = {90},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_90_a6/}
}