Geodesic
Relativistically invariant formulation of~causality in~a~nonlocal theory of~exponential growth
Teoretičeskaâ i matematičeskaâ fizika, Tome 43 (1980) no. 2, pp. 202-209

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Condition of local commutativity is generalised in a relativistically invariant way to the nonlocal fields vacuum expectation values of which grow exponentially in the momentum space. Under such a generalization local commutativity ceases to be the microcausality condition but still seems to ensure causality on large space-time scale. 
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     author = {M. A. Soloviev},
     title = {Relativistically invariant formulation of~causality in~a~nonlocal theory of~exponential growth},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {43},
     number = {2},
     year = {1980},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1980_43_2_a2/}
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M. A. Soloviev. Relativistically invariant formulation of~causality in~a~nonlocal theory of~exponential growth. Teoretičeskaâ i matematičeskaâ fizika, Tome 43 (1980) no. 2, pp. 202-209. http://geodesic.mathdoc.fr/item/TMF_1980_43_2_a2/