@article{DAN_1976_228_2_a4,
     author = {Yu. I. Zagorodnikov and P. E. Sobolevskii},
     title = {On the application of the method of fractional powers of operators to the study of a two-dimensional difference system for the 
},
     journal = {Doklady Akademii Nauk},
     pages = {281--284},
     publisher = {mathdoc},
     volume = {228},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_2_a4/}
}