@article{DAN_1961_139_1_a20,
     author = {O. I. Zavialov and V. P. Pavlov},
     title = {The matrix element of the reaction $\pi+\mathrm{N}\to\pi+\pi+\mathrm{N}$ at low energies},
     journal = {Doklady Akademii Nauk},
     pages = {79--82},
     publisher = {mathdoc},
     volume = {139},
     number = {1},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_1_a20/}
}