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J. C. Majithia, "Simple Design for Up/Down Gray Code Counters," Electronics Letters, Nov. 4, 1971, vol. 7, No. 22, pp. 658-659. |
M. Ermann, "Contadores codigo Gray", [Gray Code Counters], Revista Telegrafica Electronica, Nov. 1976, pp. 690-692, 707 & 711. |
B. C. Kim, "A Study on the Gray Code Digit Sequence," J. Korean Inst. Electron. Eng., vol. 12, No. 5, pp. 6-11, Dec. 1975. |
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G. A. Maley, "Gray Code Counter," IBM Technical Disclosure Bulletin, vol. 13, No. 4, Sep. 1970, p. 824. |
J. W. Barrs & J. C. Leininger, "Modified Gray Code Counters," IBM Technical Disclosure Bulletin, vol. 23, No. 2, Jul. 1980, pp. 460-462. |
M. V. Chkheidze et al., "Counters in Grey Code," pp. 252-262 [translation from Kibernetiku-Na Sluzhbu Kommunizmu, vol. 3, pp. 206-214]. |
"Elements of Cybernetic Systems (Selected Articles)," Academy of Sciences of Georgian Soviet Socialist Republic, United States Air Force Translation FTD-MT-66-61. |