Geodesic
Covariant formalism for equal-time commutators
Teoretičeskaâ i matematičeskaâ fizika, Tome 15 (1973) no. 1, pp. 20-42

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For equal-time commutators of general form with an arbitrary finite number of Schwinger terms a manifestly covariant formalism is developed. In this formalism the construction of relativistically invariant systems of equal-time commutators reduces to standard manipulations with four-dimensional tensor indices. Specific covariant properties of the equaltime commutators of conserved currents are obtained. Examples are considered of the “covariantization” of equal-time commutators; these examples are of not only methodological but also independent significance. 
@article{TMF_1973_15_1_a1,
     author = {Yu. M. Shirokov},
     title = {Covariant formalism for equal-time commutators},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {20--42},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_15_1_a1/}
}
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Yu. M. Shirokov. Covariant formalism for equal-time commutators. Teoretičeskaâ i matematičeskaâ fizika, Tome 15 (1973) no. 1, pp. 20-42. http://geodesic.mathdoc.fr/item/TMF_1973_15_1_a1/