فهرس المقالات Sobhan Davarpanah المقاله 1 - Developing two 4-parameter and 5-parameter exponential smoothing methods with multiplicative trend for demand forecasting 20.1001.1.17355702.2021.17.3.6.0 10.30495/jiei.2021.1922678.1096 Sobhan Davarpanah Reza Yousefi Zenouz Amir-Reza Abtahi Journal of Industrial Engineering International , العدد 4 , السنة 17 , تابستان 2021