@article{TMF_1977_30_1_a8,
     author = {A. L. Zubarev},
     title = {Schwinger variational principle for bound states and scattering problems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {73--81},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a8/}
}