@article{TMF_1987_72_1_a4,
     author = {A. N. Kvinikhidze and V. A. Matveev and A. M. Khvedelidze},
     title = {Covariant evolution operator in composite models of quantum field theory},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {45--57},
     publisher = {mathdoc},
     volume = {72},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1987_72_1_a4/}
}