(plural Sheffer strokes)
After Henry M. Sheffer.
"sheffer-stroke." YourDictionary, n.d. Web. 06 December 2018. <https://www.yourdictionary.com/sheffer-stroke>.
sheffer-stroke. (n.d.). Retrieved December 06th, 2018, from https://www.yourdictionary.com/sheffer-stroke
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