Abstract
In this paper it is shown that the set of kernels introduced previously by Gerlach, Gromes and Petzold can be enlarged considerably. The paper concludes with a remark on the theory of massless particles.
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Henning, J.J., Wolf, W. Positive definite particle densities for the positive frequency solutions of the klein gordon equation with arbitrary mass. Z. Physik 242, 12–20 (1971). https://doi.org/10.1007/BF01395375
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DOI: https://doi.org/10.1007/BF01395375