@article{SM_1979_35_2_a3,
     author = {V. I. Ruderfer},
     title = {On the zeros of the solutions of a~class of analytic systems},
     journal = {Sbornik. Mathematics},
     pages = {207--217},
     year = {1979},
     volume = {35},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1979_35_2_a3/}
}