00256nam a2200109Ia 4500008004100000041000800041082002600049100001000075245004400085260000900129300000800138211209s1979    xx            000 0 und d  aeng  a621.38275 N79 ELI/ELI  aELION  aFIBER OPTICS IN COMMUNICATIONS SYSTEMS   c1979  a244