@article{MZM_1977_21_2_a3,
     author = {A. Sharma and I. Tsimbalario},
     title = {Certain linear differential operators and generalized differences},
     journal = {Matemati\v{c}eskie zametki},
     pages = {161--172},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_2_a3/}
}