Abashnik, V. O. (2020) “CHRISTOPH SIGWART (1830–1904) AND HIS LOGIC IN THE WORKS OF ISIDOR PRODAN (1854–1919/1920)”, The Journal of V. N. Karazin Kharkiv National University, Series Philosophy. Philosophical Peripeteias, 0(63), pp. 80-88. doi: 10.26565/2226-0994-2020-63-9.