Djankov, B. 1985. Certain considerations about the epistemological and semantic foundations of logical investigations and their application. Acta Universitatis Lodziensis. Folia Philosophica. Ethica-Aesthetica-Practica. 3 (sty. 1985), 127–132. DOI:https://doi.org/10.18778/0208-6107.03.10.