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4. Robert S. Feigelson, “Growth of fiber crystals,” in Crystal Growth of Electronic Materials, edited by E. Kaldis (Elsevier Science Publishers, Amsterdam, 1985), Ch. 11.
5. For a comprehensive review of LHPG and its applications see: W. M. Yen, “Preparation of single crystal fibers”, in Insulating Materials for Optoelectronics: New Developments, edited by F. Agullo-Lopez (World Scientific, Singapore, 1995), Ch. 2.