Kozłowska J. TECHNICAL EFFICIENCY OF POLISH COMPANIES OPERATING IN THE COURIERS AND MESSENGERS SECTOR - THE APPLICATION OF DATA ENVELOPMENT ANALYSIS METHOD. QME [Internet]. 30 czerwiec 2014 [cytowane 17 maj 2024];15(2):339-48. Dostępne na: https://qme.sggw.edu.pl/article/view/3696