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2. Sur l'effet photoélectrique composé;Auger;J. de Physique et le Radium.,1925
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4. Notiz über die Spectrallinien des Wasserstoffs;Balmer;Verhandlungen der Naturforschenden Gesellschaft in Basel, Bild.,1882
5. Zweite Notiz über die Spectrallinien des Wasserstoffs ibid. 750 752