1.
Kowalewski G. Using the Sum of Positive and Negative Answers as a Supplement of Balances in Business Tendency Surveys. br [Internet]. 2010 Feb. 1 [cited 2025 Jul. 12];(4 (18):19-26. Available from: https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/1401