Brzezicki, Łukasz, and Robert Rusielik. “Measurement of Efficiency of Didactic Activities of Public Universities of Technology in Poland: Directional Distance Function With Undesirable Output Approach”. Business, Management and Economics Engineering 18, no. 1 (April 10, 2020): 73-87. Accessed May 5, 2024. https://journals.vilniustech.lt/index.php/BMEE/article/view/11982.