Mścisławski, Łukasz. 2020. “Ether, the Old Quantum Theory, Philosophy of Nature and the Problem of Continuity As Defined by Bogdan Szyszkowski: Contribution to Research on the Reception of the Old Quantum Theory and Quantum Mechanics in Poland before 1953”. Philosophical Problems in Science (Zagadnienia Filozoficzne W Nauce), no. 68 (September): 185-216. https://doi.org/10.59203/zfn.68.498.