-_ '- '- / EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH

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Dec 19, 1990 - 6Cfiollizge de France, Lab. de Physique Corpusculaire, 11 pl. M. Berthelot ... I'LPNHE, Universite's Paris VI et VII, Tour 33 (RdC), 4 place Jussieu, F—75230 Paris Cedex 05, Fiance ...... 12(1964),132; Phys. Rev. Lett. 13(1964) ...