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There is a quotation from his paper, Remarks on Nicod's Axiom and on "Generalizing Deduction", page 180.
Nicod's axiom is an axiom in propositional calculus that can be used as a sole wff in a two-axiom formalization of zeroth-order logic.
The referring paper by Łukasiewicz Remarks on Nicod's Axiom and on "Generalizing Deduction" was reviewed by H. A. Pogorzelski in the Journal of Symbolic Logic in 1965.