00314nam a2200121Ia 4500008004100000040001700041041001200058082001600070100001100086245004000097260004300137300001200180230917s9999||||xx |||||||||||||| ||und||  e110508aMAIN  aEnglish  a004.65 D26P  aDas, J 0aPrinciples of digital communication  aNew DelhibNew Age Internationalc1986  a645p p.