Geodesic
Non-lie symmetry of Galileo-invariant equation for a~particle with spin $s=1/2$
Teoretičeskaâ i matematičeskaâ fizika, Tome 89 (1991) no. 3, pp. 413-419

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A study is made of the symmetry of a Galileo-invariant spinor equation in the class of first-order differential operators. It is established that the set of first-order symmetry operators contains a superalgebra that is a superextension of the Galileo algebra. 
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     author = {R. Z. Zhdanov and W. I. Fushchych},
     title = {Non-lie symmetry of {Galileo-invariant} equation for a~particle with spin $s=1/2$},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
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     number = {3},
     year = {1991},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1991_89_3_a7/}
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R. Z. Zhdanov; W. I. Fushchych. Non-lie symmetry of Galileo-invariant equation for a~particle with spin $s=1/2$. Teoretičeskaâ i matematičeskaâ fizika, Tome 89 (1991) no. 3, pp. 413-419. http://geodesic.mathdoc.fr/item/TMF_1991_89_3_a7/