KOWALEWSKI, Grzegorz. Using the Sum of Positive and Negative Answers as a Supplement of Balances in Business Tendency Surveys. Regional Barometer. Analyses & Prognoses, [S. l.], n. 4 (18), p. 19–26, 2010. DOI: 10.56583/br.1401. Disponível em: https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/1401. Acesso em: 16 apr. 2025.