References
Martinez-Ripoll, M., Martinez-Carrera, S., Garcia-Blanco, S.: Acta Cryst. B27, 677 (1970)
Latcon, Schwarzenbach, D. ETH, Zürich (1971)
Yvon, K., Jeitschko, W., Parthé, E.: J. Appl. Cryst. 10, 73 (1977)
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The authors are indebted to R. Boutellier for performing the high-pressure experiment and to the Swiss National Science Foundation for support.