000 00306 a2200097 4500
020 _a926103151X
920 _a92-61-03151-X
245 0 _aCCITT Optical Fibres Systems Planning Guide /
_c.
710 2 _aInternational Telecommunication Union.
_eWydawca
_4pbl
260 _aGeneva :
_bITU,
_c1989.
300 _aVIII, 236 s.:
_bil.;
_c30 cm.
999 _c1843
_d1843