1. ‘On the road to universal information services (UIS): wideband packet technology’, ENTELEC'89, pp. 56–59 (1989).
2. and , ‘On the road to universal information services (UIS): the integrated access terminal’. ENTELEC'89, pp. 42–38 (1989).
3. CCITT, ‘Draft recommendation G.EMB: 5-, 4-, 3-, 2-bit/sample embedded ADPCM’. Annex 1. Appendix 1 to Question 24/XV, July 1988.