Geodesic
Unitarity condition in covariant quantum field theory with indefinite metric
Teoretičeskaâ i matematičeskaâ fizika, Tome 79 (1989) no. 3, pp. 347-358 
A. A. Slavnov. Unitarity condition in covariant quantum field theory with indefinite metric. Teoretičeskaâ i matematičeskaâ fizika, Tome 79 (1989) no. 3, pp. 347-358. http://geodesic.mathdoc.fr/item/TMF_1989_79_3_a2/
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     author = {A. A. Slavnov},
     title = {Unitarity condition in~covariant quantum field theory with indefinite metric},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {347--358},
     year = {1989},
     volume = {79},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1989_79_3_a2/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Conditions are formulated which guarantee the existence of the unitary scattering matrix acting in the subspace of positive norm states. BRST quantization is considered.

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