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2. E. Holzschuh, W. Kündig, B. D. Patterson, H. Appel, J. P. F. Sellschop and M. Stemmet, private communication.
3. B. D. Patterson, A. Hintermann, W. Kündig, P. F. Meier, F. Waldner, H. Graf, E. Recknagel, A. Weidinger, and Th. Wichert, Phys. Rev. Lett. 40, (1978) 1347.
4. E. Holzschuh, W. Kündig, and B. D. Patterson, paper entitled ?Direct Measurement of the Hyperfine Frequency of Muonium in Silicon? in this volume.
5. E. Holzschuh, H. Graf, E. Recknagel, A. Weidinger, Th. Wichert, and P. F. Meier, Phys. Rev. B20, (1979), 4391.