@article{VTGU_2013_2_a4,
     author = {V. A. Pchelintsev},
     title = {On a~functional on the class of pairs of functions},
     journal = {Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika},
     pages = {44--56},
     year = {2013},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTGU_2013_2_a4/}
}