@article{SM_2011_202_6_a5,
     author = {I. G. Tsar'kov},
     title = {Approximative compactness and nonuniqueness in variational problems, and applications to differential equations},
     journal = {Sbornik. Mathematics},
     pages = {909--934},
     year = {2011},
     volume = {202},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2011_202_6_a5/}
}