@article{TMF_1995_102_2_a1,
     author = {N. E. Dudkin and V. D. Koshmanenko},
     title = {Commutative properties of singularly perturbate operators},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {183--197},
     publisher = {mathdoc},
     volume = {102},
     number = {2},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1995_102_2_a1/}
}