Yankova-Yordanova Y, Yordanov N. HYBRID SPARE-PARTS LOGISTICS IN ENGINEERING SYSTEMS: A 3S MODEL FOR STORE, SOURCE, OR SYNTHESIZE DECISIONS: HYBRID SPARE-PARTS LOGISTICS IN ENGINEERING SYSTEMS: A 3S MODEL FOR STORE, SOURCE, OR SYNTHESIZE DECISIONS. JSAR [Internet]. 2026 Nov. 6 [cited 2026 Nov. 7];31(1):141-4. Available from: https://jsar.ftn.shu.bg/index.php/jsar/article/view/512