@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},
     year = {1971},
     volume = {9},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1971_9_1_a6/}
}