@article{IM2_1977_11_5_a8,
     author = {R. V. Duduchava},
     title = {Discrete convolution operators on the quarter plane and their indices},
     journal = {Izvestiya. Mathematics },
     pages = {1072--1084},
     publisher = {mathdoc},
     volume = {11},
     number = {5},
     year = {1977},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1977_11_5_a8/}
}