Identification of the velocity operator in an irreducible unitary representation of the Poincaré group for imaginary mass or zero mass and variable helicity
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1966 ◽
Vol 7
(6)
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pp. 949-955
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1969 ◽
Vol 10
(5)
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pp. 812-813
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1970 ◽
Vol 18
(3)
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pp. 195-203
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1975 ◽
Vol 24
(1-2)
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pp. 35-50
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2012 ◽
Vol 32
(0)
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pp. 112-120