@article{DAN_1993_329_6_a2,
     author = {V. S. Mel'nik},
     title = {Extremal problems for superposition functionals},
     journal = {Doklady Akademii Nauk},
     pages = {701--704},
     publisher = {mathdoc},
     volume = {329},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_329_6_a2/}
}