00398nam a2200157Ia 45000010005000000080041000050200018000460400013000640820020000771000013000972450037001102600048001473000011001955460007002066500027002135851140319s9999    xx            000 0 und d  a0-442-24880-6  cPK-LaUMT  a 621.382bKOR-D  aKorn, I.  aDigital communicationscKorn, I.  aNew York,USA:bVan Nostrand Reinhold,c1985  a676 p.  aEN  aDigital communications