Concentrator-Type Subscriber Station for a Service-Integrated Network with Decentralized Exchange. - J.-P. Behr; Ulrich Killat; Johann Krüger; D. Riekmann; M. Maisel (Kommunikation in Verteilten Systemen, 1981)

System Concept of a PABX Integrating Voice and Data. - J.-P. Behr; Barbara Fink; Ulrich Killat; J. Müller; D. Riekmann (ICC (1), 1984)