Design of a microprocessor-controlled PABX. - Ahmed A. Kamal; M. S. Metwally; A. Abdel-Fattah; H. A. Abou-Kandil (Microprocess. Microsystems, 1982)

Design of a multimicroprocessor-controlled PABX: Continuing decreases in component costs mean that systems such as telephone branch exchanges can handle large data traffic relatively cheaply. - A. Abdel-Fattah; H. A. H. El-Taweel (Microprocess. Microsystems, 1985)