@article{DAN_1963_149_1_a20,
     author = {R. M. Muradyan},
     title = {A study of the analytic properties of ladder diagrams by the method of complex orbital angular momenta},
     journal = {Doklady Akademii Nauk},
     pages = {80--83},
     publisher = {mathdoc},
     volume = {149},
     number = {1},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_1_a20/}
}