Geodesic
Classification of exactly integrable embeddings of two-dimensional manifolds. The coefficients of the third fundamental forms
Teoretičeskaâ i matematičeskaâ fizika, Tome 60 (1984) no. 1, pp. 9-23 
M. V. Saveliev. Classification of exactly integrable embeddings of two-dimensional manifolds. The coefficients of the third fundamental forms. Teoretičeskaâ i matematičeskaâ fizika, Tome 60 (1984) no. 1, pp. 9-23. http://geodesic.mathdoc.fr/item/TMF_1984_60_1_a1/
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     title = {Classification of exactly integrable embeddings of two-dimensional manifolds. {The} coefficients of the third fundamental forms},
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Voir la notice de l'article provenant de la source Math-Net.Ru

A method of classifying exactly and completely integrable emb.eddings in Riemannian or non-Riemannian enveloping Spaces is proposed. It is based on the algebraic approach [6, 8] to the integration of nonlinear dynamical systems. The grading conditions and the spectral composition of the Lax operators, which take values in a graded Lie algebra and distinguish the integrable classes of two-dimensional systems, are formulated in terms of the structure of the tensors of the third fundamental forms. In the framework of the method, each embedding of the three-dimensional subalgebra $\text{sl}(2)$ in a simple finite-dimensional (infinite-dimensional of finite growth) Lie algebra is associated with a definite class of exactly (completely) integrable embeddings of a two-dimensional manifold in a corresponding enveloping space equipped with the structure of .

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