1. G. Ungerboeck, Channel coding with multilevel/phase signals. IEEE Trans. Inf. Theory 28, 55–67 (1982)
2. G.D. Forney, R.G. Gallager, G.R. Lang, F.M. Longstaff, S.U. Qureshi, Efficient modulation for band-limited channels. IEEE Trans. Sel. Areas. Commun. SAC-2, 632–647 (1984)
3. L.F. Wei, Rotationally invariant convolutional channel coding with expanded signal space-part I: 180 degrees. IEEE Trans. Sel. Areas. Commun. SAC-2, 659–672 (1984)
4. L.F. Wei, Rotationally invariant convolutional channel coding with expanded signal space-part 11: nonlinear codes. IEEE Trans. Sel. Areas. Commun. SAC-2, 672–686 (1984)
5. A.R. Calderbank, J.E. Mazo, A new description of trellis codes. IEEE Trans. Inf. Theory IT-30, 784–791 (1984)