KOZŁOWSKA, J. TECHNICAL EFFICIENCY OF POLISH COMPANIES OPERATING IN THE COURIERS AND MESSENGERS SECTOR - THE APPLICATION OF DATA ENVELOPMENT ANALYSIS METHOD. Metody Ilościowe w Badaniach Ekonomicznych, [S. l.], v. 15, n. 2, p. 339–348, 2014. Disponível em: https://qme.sggw.edu.pl/article/view/3696. Acesso em: 4 grudz. 2024.