@article{SM_2005_196_10_a1,
     author = {A. I. Bulgakov and O. P. Belyaeva and A. A. Grigorenko},
     title = {On the theory of perturbed inclusions and its applications},
     journal = {Sbornik. Mathematics},
     pages = {1421--1472},
     publisher = {mathdoc},
     volume = {196},
     number = {10},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2005_196_10_a1/}
}