A New Method of Sensitivity Analysis of Returns to Scale in Two-Stage Network; A Case Study of the Insurance Industry in Iran

Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran.

Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran.

Department of Mathematics, Rasht Branch, Islamic Azad University, Rasht, Iran.

Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran.