Helms, H. D., Kaiser, J. F., Rabiner, L. R., Helms, H. D., Kaiser, J. F., & Rabiner, L. R. (1975). Literature in digital signal processing: Author and permuted title index (Rev. and expanded ed.). New York: IEEE Press.

Helms, Howard D., James F. Kaiser, Lawrence R. Rabiner, Howard D. Helms, James F. Kaiser, and Lawrence R. Rabiner. Literature in Digital Signal Processing: Author and Permuted Title Index. Rev. and expanded ed. New York: IEEE Press, 1975.

Helms, Howard D., et al. Literature in Digital Signal Processing: Author and Permuted Title Index. Rev. and expanded ed. New York: IEEE Press, 1975.