@article{TM_1987_180_a83,
     author = {L. P. Kuptsov},
     title = {Averaging operators and partial differential equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {145--146},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_180_a83/}
}