List of Articles product portfolio Open Access Article Abstract Page Full-Text 1 - A Regret Minimization Approach in Product Portfolio Management with respect to Customers’ Price-sensitivity Maryam Esmaeili Azadeh Arjmand 10.22094/joie.2018.746.1476 Open Access Article Abstract Page Full-Text 2 - Designing and testing the product portfolio model with the consumer behavior approach in the service industry of free specialized higher education mehdi mansoury vahid reza mirabi seyed mahmoud shabghou monsef