@article{AA_1999_11_4_a6,
     author = {S. I. Repin},
     title = {A~posteriori estimates for the accuracy of variational methods for problems with nonconvex functionals},
     journal = {Algebra i analiz},
     pages = {151--182},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1999_11_4_a6/}
}