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Rafal Urbaniak, Lesniewski and Russell's paradox: Some problemsHistory and Philosophy of Logic 29 (2): 115-146. 2008.
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Rafal Urbaniak, Lesniewski's Systems of Logic and Mereology; History and Re-EvaluationDissertation, University of Calgary. 2008.
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Rafał Urbaniak, Some non-standard interpretations of the axiomatic basis of Leśniewski’s OntologyAustralasian Journal of Logic 4 (5): 13-46. 2006.
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Rafal Urbaniak, On representing sentential connectives of Lesniewski's elementary PrototheticJournal of Logic and Computation 16 (4): 451-460. 2006.