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- [6] Up-down ternary strings Grimaldi, Ralph P. (ralph.grimaldi@rose-hulman.edu), 2018, Charles Babbage Research Centre (104):
- [9] SYNTHESIS OF UP-DOWN COUNTERS IEEE TRANSACTIONS ON ELECTRONIC COMPUTERS, 1967, EC16 (02): : 146 - &
- [10] SYNCHRONOUS UP-DOWN COUNTER IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS AND CONTROL INSTRUMENTATION, 1978, 25 (02): : 196 - 196