@article{MZM_1991_49_1_a11,
     author = {Yu. I. Sapronov},
     title = {Nonlocal finite dimensional reductions in variational boundary value problems},
     journal = {Matemati\v{c}eskie zametki},
     pages = {94--103},
     publisher = {mathdoc},
     volume = {49},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_49_1_a11/}
}