@article{AA_2015_27_1_a1,
     author = {R. A. Gaisin},
     title = {Estimation of intermediate derivatives and theorems of {Bang} {type.~I}},
     journal = {Algebra i analiz},
     pages = {23--48},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2015_27_1_a1/}
}