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Modalities in Ackermann's "Rigorous Implication"
Alan Ross Anderson and Nuel D. Belnap, Jr.
The Journal of Symbolic Logic
Vol. 24, No. 2 (Jun., 1959), pp. 107-111
Published by: Association for Symbolic Logic
Stable URL: http://www.jstor.org/stable/2964754
Page Count: 5