Efficient coding of LSP parameters using split matrix quantisation. - Costas S. Xydeas; Charalampos Papanastasiou (ICASSP, 1995)

Efficient mixed excitation models in LPC based prototype interpolation speech coders. - Charalampos Papanastasiou; Costas S. Xydeas (ICASSP, 1997)

Split matrix quantization of LPC parameters. - Costas S. Xydeas; Charalampos Papanastasiou (IEEE Trans. Speech Audio Process., 1999)