00497nam a2200181Ia 4500 CTU_97604 210402s9999 xx 000 0 und d 621.3810414 K27 Keiser, Gerd Optical fiber communications Gerd Keiser London McGraw - Hill International 1983 Optical communications,Fiber optics Trúc Trung tâm Học liệu Trường Đại học Cần Thơ