Шаврин ВН. On the notion of sub-centers in settlement systems of municipal districts. Вестник ТвГУ. Сер. география и геоэкология [Internet]. 2019 Feb. 28 [cited 2024 Nov. 13];(1 (11):66-75. Available from: https://journal.tversu.ru/index.php/geo/article/view/128