@article{MZM_2013_93_4_a2,
     author = {I. Vodova},
     title = {Chain {Rule} for {Conic} {Derivatives}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {509--529},
     publisher = {mathdoc},
     volume = {93},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2013_93_4_a2/}
}