@article{DAN_1990_312_1_a15,
     author = {A. I. Zaslavskii},
     title = {Ramification of massless {Feynman} integrals around a {Landau}},
     journal = {Doklady Akademii Nauk},
     pages = {72--76},
     publisher = {mathdoc},
     volume = {312},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_312_1_a15/}
}