Geodesic
Symmetry algebra of nonlinear integrable equations
Teoretičeskaâ i matematičeskaâ fizika, Tome 95 (1993) no. 1, pp. 34-41

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The complete symmetry algebras of the Veselov–Novikov equation and of the modified Kadomtsev–Petviashvili equation are constructed. Some related questions are discussed. 
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     author = {L. V. Ryzhik and E. I. Shulman},
     title = {Symmetry algebra of nonlinear integrable equations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     volume = {95},
     number = {1},
     year = {1993},
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L. V. Ryzhik; E. I. Shulman. Symmetry algebra of nonlinear integrable equations. Teoretičeskaâ i matematičeskaâ fizika, Tome 95 (1993) no. 1, pp. 34-41. http://geodesic.mathdoc.fr/item/TMF_1993_95_1_a2/