@article{VSPUI_2013_2_a1,
     author = {K. M. Bregman},
     title = {Differentiation algorithm based on the additional variables method},
     journal = {Vestnik Sankt-Peterburgskogo universiteta. Prikladna\^a matematika, informatika, processy upravleni\^a},
     pages = {14--26},
     publisher = {mathdoc},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSPUI_2013_2_a1/}
}