Geodesic
On~the~$S$ matrix for~a~field theory with~Lagrangians that depend on~derivatives
Teoretičeskaâ i matematičeskaâ fizika, Tome 6 (1971) no. 3, pp. 318-327

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A study is made of the theory of a scalar quantized field with an interaction that depends on derivatives. A covariant expression is obtained for the $S$ matrix in terms of the interaction Lagrangian. It is shown that the theory is invariant under a local transformation of the field variable. An investigation is made into the modification of these results when regularization is introduced. 
@article{TMF_1971_6_3_a1,
     author = {M. A. Braun and Yu. A. Evlashev},
     title = {On~the~$S$ matrix for~a~field theory {with~Lagrangians} that depend on~derivatives},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {318--327},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1971_6_3_a1/}
}
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M. A. Braun; Yu. A. Evlashev. On~the~$S$ matrix for~a~field theory with~Lagrangians that depend on~derivatives. Teoretičeskaâ i matematičeskaâ fizika, Tome 6 (1971) no. 3, pp. 318-327. http://geodesic.mathdoc.fr/item/TMF_1971_6_3_a1/