(plural Sheffer strokes)
After Henry M. Sheffer.
"sheffer-stroke." YourDictionary, n.d. Web. 19 September 2018. <http://www.yourdictionary.com/sheffer-stroke>.
sheffer-stroke. (n.d.). Retrieved September 19th, 2018, from http://www.yourdictionary.com/sheffer-stroke
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