1. Bambauer, H. U., M. Corlett, E. Eberhard, R. Gubser, F. Laves, H. U. Nissen, and K. Viswanathan: Variations in x-ray powder patterns of low structural state plagioclases. Schweiz. mineral. petrog. Mitt. 45, 327?330 (1965).
2. Brown, W. L.: The crystallographic and petrologic significance of peristerite unmixing in the acid plagioclases. Z. Krist. 113, 330?344 (1960).
3. ?: Peristerite unmixing in the plagioclases and metamorphic facies series. Norsk Geol. Tidssk. 42, pt. 2, 354?382 (1962).
4. Christie, O. H. J.: Note on the equilibrium between plagioclase and epidote. Norsk Geol. Tidssk. 39, 268?271 (1959).
5. Deer, W. A., R. A. Howie, and J. Zussman: Rock forming minerals, vol. 5, Non-silicates, 371 p. London: Longmans, Green & Co. Ltd. 1962.