@article{ZNSL_1992_203_a6,
     author = {A. Ya. Kazakov},
     title = {On condition of a~``breakdown'' in the singularly perturbed systems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {83--91},
     publisher = {mathdoc},
     volume = {203},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1992_203_a6/}
}