HERTSYK, V. A. THE MARKETING RESEARCH PROBLEMS OF THE SALES COMPANY FORECASTING. Science and Transport Progress , [S. l.], n. 19, p. 248–252, 2007. DOI: 10.15802/stp2007/17575. Disponível em: https://stp.ust.edu.ua/article/view/17575. Acesso em: 6 may. 2024.