1. AT&T contributions to CCITT Study Group XV and T1Y1.2 (October 1988–July 1989).
2. Detailed description of AT&T’s LD-CELP algorithm, contributions to CCITT Study Group XV, Nov. 1989.
3. Draft recommendation G.728 (coding of speech at 16 kb/s using LD-CELP), CCITT Study Group XV, Dec. 1991.
4. J.-H. Chen, “High-quality 16 kb/s speech coding with a one-way delay less than 2 ms”, Proc. Int. Coat, on Acoust. Speech, Signed Processing, (Albuquerque, NM), April 1990, pp. 453–456.
5. V. Iyengar and P. Kabal, “A low-delay 16 kbits/sec speech coder”, IEEE Trans. Signal Processing, vol. 39, May 1991, pp. 1049–1057.