@article{MZM_1987_42_1_a4,
     author = {D. V. Ktitarev},
     title = {Feynman's formula in a phase space for a certain class of systems of pseudodifferential equations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {40--49},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_42_1_a4/}
}