@article{IM2_1969_3_3_a7,
     author = {M. F. Timan},
     title = {Difference properties of functions of several variables},
     journal = {Izvestiya. Mathematics },
     pages = {633--642},
     publisher = {mathdoc},
     volume = {3},
     number = {3},
     year = {1969},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1969_3_3_a7/}
}