Geodesic
Three sequences of formulas with two variables in the positive propositional logic
Izvestiya. Mathematics , Tome 2 (1968) no. 4, pp. 845-848

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Some questions of the positive calculus are considered. 
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V. A. Yankov. Three sequences of formulas with two variables in the positive propositional logic. Izvestiya. Mathematics , Tome 2 (1968) no. 4, pp. 845-848. http://geodesic.mathdoc.fr/item/IM2_1968_2_4_a9/