Ozola S. PLANNING AND THE SPATIAL SOLUTION OF FORTIFIED URBAN STRUCTURES IN SECULAR POWER CENTRES BUILT BY THE LIVONIAN BROTHERS OF THE SWORD (1202–1237). SIE [Internet]. 2020 May 20 [cited 2024 Nov. 23];5:775-94. Available from: https://journals.ru.lv/index.php/SIE/article/view/4872