Issue No.05 - May (1971 vol.20)
S. Zohar , Jet Propulsion Lab. Calif. Inst. Tech.
My paper "Negative Radix Conversion," contained the only reference known to me at the time .
S. Zohar, "Author's Reply<sup>2</sup>", IEEE Transactions on Computers, vol.20, no. 5, pp. 587, May 1971, doi:10.1109/T-C.1971.223302