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J. Kulhanek:Journ. Math. Phys. (to appear in 1971).
C. W. Misner: inBrandeis University Summer Institute in Theoretical Physics, Astrophysics and General Relativity, Vol.1 (New York, 1968), p. 143.
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Kulhanek, J. Geometrical optics with scalar frequency. Lett. Nuovo Cimento 2, 468–470 (1971). https://doi.org/10.1007/BF02804563
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DOI: https://doi.org/10.1007/BF02804563