@article{RM_1974_29_4_a13,
     author = {S. A. Kashchenko and Yu. S. Kolesov},
     title = {A~test for the stability of the solutions of singularly perturbed second order equations with periodic coefficients},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1974_29_4_a13/}
}