Geodesic
Elliptic bundle and generating operators
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 7, Tome 161 (1987), pp. 76-87 
Yu. N. Sidorenko. Elliptic bundle and generating operators. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 7, Tome 161 (1987), pp. 76-87. http://geodesic.mathdoc.fr/item/ZNSL_1987_161_a6/
@article{ZNSL_1987_161_a6,
     author = {Yu. N. Sidorenko},
     title = {Elliptic bundle and generating operators},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {76--87},
     year = {1987},
     volume = {161},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_161_a6/}
}
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The hierarchy of Poisson Hamiltonian structures connected with the “elliptic” spectral problem is built. The generating operators are found connected with the Landau–Lifshitz equation and the asymmetric chiral $O(3)$-field.