Lazarević D, Dobrodolac M, Švadlenka L, Stanivuković B. A model for business performance improvement: a case of the postal company. JBEM [Internet]. 2020Apr.1 [cited 2024Nov.1];21(2):564-92. Available from: https://jcem.vgtu.lt/index.php/JBEM/article/view/12193