00267nam a2200121Ia 4500008004100000020002200041100001700063245002100080260001400101260001200115260000900127300000900136221231s9999    xx            000 0 und d  a978-81-317-0780-7  aBlack Uyless 0aOptical Networks  aNew Delhi  bPearson  c2011  a323P