Multirate vector quantization of image pyramids. - R. Padmanabha Rao; William A. Pearlman (ICASSP, 1991)

On entropy of pyramid structures. - R. Padmanabha Rao; William A. Pearlman (IEEE Trans. Inf. Theory, 1991)

Alphabet-constrained vector quantization. - R. Padmanabha Rao; William A. Pearlman (IEEE Trans. Inf. Theory, 1993)