@article{CHEB_2015_16_3_a12,
     author = {P. L. Ivankov},
     title = {On differentiation with respect to parameter},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {285--294},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2015_16_3_a12/}
}