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JOURNALS
// Matematicheskii Sbornik
// Archive
Mat. Sb. (N.S.),
1953
Volume 32(74),
Number 1,
Pages
225–248
(Mi sm5305)
This article is cited in
1
paper
On N. V. Efimov's
$N$
-invariants from the theory of deformation of surfaces
V. A. Tartakovskii
Received:
09.05.1952
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