@article{MZM_1989_45_3_a4,
     author = {F. V. Guseinov},
     title = {Lower semicontinuous extension of the fundamental problem of calculus of variations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {43--52},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_45_3_a4/}
}