Some differential properties of functions of two variables
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1958), pp. 266-271.

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     author = {F. I. Shmidov},
     title = {Some differential properties of functions of two variables},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {266--271},
     publisher = {mathdoc},
     number = {6},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1958_6_a25/}
}
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F. I. Shmidov. Some differential properties of functions of two variables. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1958), pp. 266-271. http://geodesic.mathdoc.fr/item/IVM_1958_6_a25/