Zigmunde, Alīda, and Alvars Baldiņš. 2018. “Graduates and Students of the Riga Polytechnicum Riga Polytechnic Institute - Participants of the Proclamation of Independent Republic of Latvia”. History of Engineering Sciences and Institutions of Higher Education 2 (November): 12-23. https://doi.org/10.7250/HESIHE.2018.002.