University of Tehran Iranian Economic Review 1026-6542 17 2 2013 05 01 A Differential Oligopoly Game with Sticky Prices and Environmental Externality 83 106 53524 10.22059/ier.2013.53524 EN Amir Mansour Tehranchian Samad Yadollahpour Arabi Journal Article 2015 05 18 https://ier.ut.ac.ir/article_53524_23b88770d67475006f5d6b1ba21f0ca8.pdf