“…In regard to return to scale, there were studies used VRS these studies were (Ali et al, 2017), (Kakeman et al, 2016), (Kalhor et al, 2016), (Mujasi et al, 2016), (H. Li & Dong, 2015), (Applanaidu et al, 2014), (J. P. Harrison & Meyer, 2014), (Jehu-Appiah et al, 2014), (Jat & Sebastian, 2013), (Yusefzadeh, Ghaderi, Bagherzade, & Barouni, 2013). For CRS model, the studies were shared in this model type were (N. Li, Wang, Ni, & Wang, 2017), , (Cheng et al, 2016).…”