Razavi Hajiagha, Seyed Hossein, et al. “A Complex Proportional Assessment Method for Group Decision Making in an Interval-Valued Intuitionistic Fuzzy Environment”. Technological and Economic Development of Economy, vol. 19, no. 1, Apr. 2013, pp. 22-37, https://doi.org/10.3846/20294913.2012.762953.