@article{IVM_2002_3_a0,
     author = {V. N. Bobochko},
     title = {A~differential turning point in the theory of singular {perturbations.~I}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--14},
     publisher = {mathdoc},
     number = {3},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2002_3_a0/}
}