БальсевичА. А., ПивовароваС. Г., and ПодколзинаЕ. А. “The Information Transparency of Public Procurement in Russian Regions: Estimation and Explanations”. State Procurement: Management, Placement, Maintenance. Academic Appendix, no. 5, Dec. 2011, pp. 38-61, https://law-journal.hse.ru/index.php/gzpr/article/view/2848.