Geodesic
On the sets of points of finite and infinite curvature of the graph of a convex function
Doklady Akademii Nauk, Tome 262 (1982) no. 4, pp. 800-803 
A. B. Merkov. On the sets of points of finite and infinite curvature of the graph of a convex function. Doklady Akademii Nauk, Tome 262 (1982) no. 4, pp. 800-803. http://geodesic.mathdoc.fr/item/DAN_1982_262_4_a6/
@article{DAN_1982_262_4_a6,
     author = {A. B. Merkov},
     title = {On the sets of points of finite and infinite curvature of the graph of a convex function},
     journal = {Doklady Akademii Nauk},
     pages = {800--803},
     year = {1982},
     volume = {262},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_262_4_a6/}
}
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