Geodesic
Generalized functionally invariant solutions for equations of the elasticity theory
Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 4 (2001) no. 1, pp. 41-50.

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For the first time, necessary and sufficient conditions of the existence of generalized functionally invariant decisions for the equation of elasticity theory are received. The investigation of these conditions is conducted, and decisions are built in a class of flat and spherical waves for longitudinal and diametrical oscillations. 
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É. V. Nikol'skii. Generalized functionally invariant solutions for equations of the elasticity theory. Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 4 (2001) no. 1, pp. 41-50. http://geodesic.mathdoc.fr/item/SJVM_2001_4_1_a4/

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