00370nam a2200145Ia 4500008004100000020002200041082000800063082001000071100002000081100002000101245003700121260001400158260004300172260000900215230118s9999||||xx |||||||||||||| ||und||  a978-0-07-463682-4  a537  bKEN/E  ageorgebkennedy  bbernard   davis 0aelectronic communication systems  anew delhi  btata mcgrawhill publishing company ltd  c1999