Comparison of high speed hardware and software implementation approaches for a multichannel PCM-Delta converter. - I. Versvik; Ole Berg (ICASSP, 1983)

Fully vector-quantized subband coding with adaptive codebook allocation. - Allen Gersho; Tor A. Ramstad; I. Versvik (ICASSP, 1984)

Subband coding with vector quantization. - I. Versvik; Hans C. Guren (ICASSP, 1986)