1. P. Asnaghi, R. Cislaghi, S. Rigobello: Transmission network protection and reconfiguration by means of digital cross-connect systems. In: Proceedings of the Fourth International Network Planning Symposium, Sept. 1989, p. 365-372.
2. ETSI Network Aspects (NA) Technical Committee: General aspects of quality of service and network performance in digital networks, including ISDN. ETSI Technical Report, ETR 003, Aug. 1990.
3. CCITT Supplement No. 6: Terms and definitions for quality of service, network performance, dependability and trafficability studies. “CCITT Blue Book”, Fascicle 11.3, 1988, p. 317-365.
4. CCITT Recommendation E.800: Quality of service and dependability vocabulary. “CCITT Blue Book”, Fascicle II.3, 1988, p. 257-268.