@article{MZM_1985_37_5_a12,
     author = {A. I. Panasyuk},
     title = {Differential equation for nonconvex attainment sets},
     journal = {Matemati\v{c}eskie zametki},
     pages = {717--726},
     publisher = {mathdoc},
     volume = {37},
     number = {5},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_37_5_a12/}
}