Rogowski, Waldemar. “Deferred Payment, Late Payment, Payment Backlog and How They Are Interconnected (the First of Two Articles about Payment Delays)”. Journal of Management and Financial Sciences, no. 29 (July 29, 2019): 159–184. Accessed April 28, 2024. https://econjournals.sgh.waw.pl/JMFS/article/view/751.