Marketing mix instruments as factors of improvement of students' satisfaction in higher education institutions in Republic of Serbia and Spain - Brkanlic, Sandra; Sánchez-García, Javier; Breso-Esteve, Edgar; Brkic, Ivana; Ciric, Maja; Tatarski, Jovana; Garda evic, Jovana; Petrovic, Marko (Brkanlic, Sandra Sánchez-García, Javier Breso-Esteve, Edgar Brkic, Ivana Ciric, Maja Tatarski, Jovana Garda evic, Jovana Petrovic, Marko 2020 Marketing mix instruments as factors of improvement of students' satisfaction in higher education institutions in Republic of Serbia and Spain Sustainability 12 18 1 16, 2025)