@article{DAN_1986_289_4_a2,
     author = {F. A. Gadzhiev},
     title = {Functions of four variables on the three-dimensional sphere, which are not representable as a superposition of functions of a smaller number of variables},
     journal = {Doklady Akademii Nauk},
     pages = {785--788},
     publisher = {mathdoc},
     volume = {289},
     number = {4},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_289_4_a2/}
}