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Work supported in part by the Science Research Council.
On leave from the University of Neuchâtol, Switzerland, on a grant from the Swiss Institute for Nuclear Research.
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Germond, J.F., Wilkin, C. Exchange current effects in pion double charge exchange from4He. Lett. Nuovo Cimento 13, 605–609 (1975). https://doi.org/10.1007/BF02745898
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DOI: https://doi.org/10.1007/BF02745898