@article{MZM_1968_4_3_a3,
     author = {D. V. Salekhov},
     title = {On a property of $N$-functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {281--290},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_3_a3/}
}