@article{ZNSL_1971_21_a0,
     author = {O. A. Ladyzhenskaya},
     title = {Editor's preface},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {3--4},
     publisher = {mathdoc},
     volume = {21},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_21_a0/}
}