@article{TMF_1980_43_3_a2,
     author = {Yu. S. Vernov and A. F. Kurbatov},
     title = {Lower bound and zeros of~the scattering amplitude},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {323--329},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1980_43_3_a2/}
}