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Research sponsored by the Air Force Office of Scientific Research, Office of Aerospace Research, United States Air Force, under AFOSR grant number EOOAR-68-0010, through the European Office of Aerospace Research.
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Gronau, M. The Ratioη 00/η +− in current-current models. Lettere Nuovo Cimento (1969-1970) 1, 509–512 (1969). https://doi.org/10.1007/BF02753940
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DOI: https://doi.org/10.1007/BF02753940