00301nam a2200097Ia 4500008004100000082001900041100001700060245003400077260003800111650005400149211119s9999||||xx |||||||||||||| ||und||  a621.382bKEI-O  aKeiser, Gerd 0aOptical Fiber Commmunications  bMcgraw Hill CompanyaLondonc1978  aTechnologyvApplied physicsPhysicsxGeneral Stack