Geodesic
Sequences of functions of the form $f(X(x)+Y(y))$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 4 
I. A. Vainshtein; M. A. Kreines. Sequences of functions of the form $f(X(x)+Y(y))$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 4. http://geodesic.mathdoc.fr/item/RM_1960_15_4_a6/
@article{RM_1960_15_4_a6,
     author = {I. A. Vainshtein and M. A. Kreines},
     title = {Sequences of functions of the form $f(X(x)+Y(y))$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1960},
     volume = {15},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_4_a6/}
}
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