Hallas-Murula, Karin. 2022. “Eugen Habermann (1884–1944) and Herbert Johanson (1884–1964) – from Studies at Riga Polytechnic Institute to the Top of Estonian Architecture”. History of Engineering Sciences and Institutions of Higher Education 6 (September): 35-55. https://doi.org/10.7250/HESIHE.2022.003.