@article{MZM_1992_51_5_a5,
     author = {R. S. Egikyan and D. V. Ktitarev},
     title = {Feynman's formula in phase space for systems of pseudodifferential equations with analytic symbols},
     journal = {Matemati\v{c}eskie zametki},
     pages = {44--50},
     publisher = {mathdoc},
     volume = {51},
     number = {5},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1992_51_5_a5/}
}