@article{IM2_1990_35_1_a8,
     author = {A. V. Pozhidaev and V. V. Yurinskii},
     title = {On the error of averaging symmetric elliptic systems},
     journal = {Izvestiya. Mathematics},
     pages = {183--201},
     year = {1990},
     volume = {35},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1990_35_1_a8/}
}