TI - Modeling and analysis of effective factors in the outsourcing of R&D projects by SEM and ISM approaches: A case study of "Iranian aviation industries organization" AU - TAGHIZADEH, G. AU - TORABI, H. AU - RAJABZADEH, M. SO - Sigma Journal of Engineering and Natural Sciences 2022;40:196-207. DO - 10.14744/sigma.2022.00016