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3. A. V. Pogorelov, Geometric Methods in the Nonlinear Theory of Elastic Shells (Nauka, Moscow, 1967) [in Russian].
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5. M. I. Shtogrin, “Special Isometric Transformations of a Cone,” Usp. Mat. Nauk 63(2), 183–184 (2008) [Russ. Math. Surv. 63, 388–390 (2008)].