@article{DE_1999_35_5_a2,
     author = {A. P. Afanas'ev},
     title = {A generalized isoperimetric problem with a linear shift in the objective function},
     journal = {Differencialʹnye uravneni\^a},
     pages = {600--605},
     publisher = {mathdoc},
     volume = {35},
     number = {5},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_5_a2/}
}