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Linsky, Leonard and
Schumm, George F. 1971.
“Frege’s Way Out: A Footnote.” Analysis 32: 5–7.
Schumm, George F. 1975.
“Wajsberg Normal Forms for S5.” The Journal of Philosophical Logic 4(3): 357–360.
Schumm, George F. 1978.
“Putting \(\mathbf{K}\) in its Place.” Notre Dame Journal of Formal Logic 19: 623–628.
Shapiro, Stewart and
Schumm, George F. 1990.
“Expressive Completeness and Decidability.” Notre Dame Journal of Formal Logic 31: 576–579.