[3-1] A Light-Focusing Fiber Guide Prepared by Ion-Exchange Techniques I. Kitano、K. Koizumi、H. Matsumura、T. Uchida、M. Furukawa (1.Nippn Sheet Glass Co., Ltd.、2.Nippon Electric Co., Ltd.) https://doi.org/10.7567/SSDM.1969.3-1