Geodesic
On $PTC$-noninvariant Lagrangians
Teoretičeskaâ i matematičeskaâ fizika, Tome 9 (1971) no. 1, pp. 91-93

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With the aid of the energy sign and helicity operators the Poincaré-noninvariant Lagrangians and the equations of motion are constructed, which are not invariant under the $PTC$-transformation. 
@article{TMF_1971_9_1_a6,
     author = {W. I. Fushchych},
     title = {On $PTC$-noninvariant {Lagrangians}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {91--93},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1971_9_1_a6/}
}
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W. I. Fushchych. On $PTC$-noninvariant Lagrangians. Teoretičeskaâ i matematičeskaâ fizika, Tome 9 (1971) no. 1, pp. 91-93. http://geodesic.mathdoc.fr/item/TMF_1971_9_1_a6/