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Czapek, Gerhard; Federspiel, Andrea; Flükiger, Andreas; Frei, Daniel; Hahn, Beat; Hug, Carl; Hugentobler, Edwin; Krebs, Walther; Moser, Urs; Muster, Daniel; Ramseyer, Erich; Scheidiger, Hans; Schlatter, Peter; Stucki, Gerhard; Abela, Raphael; Renker, Dieter; Steiner, Erich (1993). Branching ratio for the rare pion decay into positron and neutrino. Physical review letters, 70(1), pp. 17-20. American Physical Society 10.1103/PhysRevLett.70.17
