Muhammad Dzaky Al Tovic, & Eko Budi Santoso. (2026). Frontier Shifts Without Ranking Changes: Evaluating Service Level Agreements on the Efficiency and Productivity of Energy Tanker Fleets Using a DEA–Malmquist Approach and Mixed Methods. Jurnal Ilmiah Multidisiplin Indonesia (JIM-ID), 5(07), 1953–1969. Retrieved from https://ejournal.seaninstitute.or.id/index.php/esaprom/article/view/8875