000 00270nam a22001217a 4500
020 _a101259006875
082 _a681.25
_bKEI/O
100 _aGerd Keiser
245 _aOptical Fiber Communications
260 _aNew Delhi
_bMcGrawhill
_c2020
300 _a662
942 _cBK
999 _c19350
_d19350