@article{DE_1990_26_8_a25,
     author = {D. V. Ktitarev},
     title = {The {Feynman} formula for systems of partial differential equations with constant or rapidly decreasing coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1460--1462},
     publisher = {mathdoc},
     volume = {26},
     number = {8},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_8_a25/}
}