@article{SM_2005_196_4_a3,
     author = {G. V. Sandrakov},
     title = {Homogenization of variational inequalities for obstacle problems},
     journal = {Sbornik. Mathematics},
     pages = {541--560},
     year = {2005},
     volume = {196},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2005_196_4_a3/}
}