@article{UZKU_2011_153_1_a14,
     author = {A. V. Kazantsev},
     title = {Bifurcations and new uniqueness criteria for the critical points of hyperbolic derivatives},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {180--194},
     publisher = {mathdoc},
     volume = {153},
     number = {1},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2011_153_1_a14/}
}