Geodesic
Sets of points of discontinuity and differentiability of certain operators
Matematičeskie zametki, Tome 9 (1971) no. 3, pp. 323-331 
E. N. Marchenko; N. V. Marchenko. Sets of points of discontinuity and differentiability of certain operators. Matematičeskie zametki, Tome 9 (1971) no. 3, pp. 323-331. http://geodesic.mathdoc.fr/item/MZM_1971_9_3_a10/
@article{MZM_1971_9_3_a10,
     author = {E. N. Marchenko and N. V. Marchenko},
     title = {Sets of points of discontinuity and differentiability of certain operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {323--331},
     year = {1971},
     volume = {9},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_3_a10/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

An investigation of the structure of the set of points of $f$-continuity of an operator $A$ ($f$-continuity is an analog of the Lipschitz condition).