Pastarus, Juri-Rivaldo. “TOOMPEA HILL STABILITY AND TALLINN AREA SUBSIDENCE”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 1999): 136–141. Accessed April 6, 2025. https://journals23.rta.lv/index.php/ETR/article/view/1886.