Šellers, Daniels, et al. “Activities of Professor of Riga Polytechnicum Riga Polytechnic Institute Heinrich Malcher (1848– 1927) and His Contribution to Latvia”. History of Engineering Sciences and Institutions of Higher Education, vol. 8, Dec. 2024, pp. 33-45, https://doi.org/10.7250/HESIHE.2024.003.