@article{ZNSL_2004_318_a3,
     author = {M. Sh. Birman and T. A. Suslina},
     title = {Homogenization of a~multidimensional periodic elliptic operator in a~neighbourhood of the edge of the internal gap},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {60--74},
     publisher = {mathdoc},
     volume = {318},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2004_318_a3/}
}