Преображенский, Ю. В., and Е. С. Кушнир. “Territorial Aspects of the Development of Public Catering in the Saratov Region and Saratov City”. HERALD OF TVER STATE UNIVERSITY. SERIES: GEOGRAPHY AND GEOECOLOGY, no. 2, May 2018, https://journal.tversu.ru/index.php/geo/article/view/37.