@article{VMUMM_1985_2_a2,
     author = {E. B. Pekar},
     title = {Relationship between convexity and smoothness in problems of variational calculus},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {9--13},
     publisher = {mathdoc},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1985_2_a2/}
}