Sobral, M., Costa, A. P. and Almeida Filho, A. (2010) “Multi-criteria model for classifying clients of companies distributing liquefied petroleum gas”, Brazilian Journal of Operations & Production Management, 7(1), pp. 53-75. Available at: https://bjopm.emnuvens.com.br/bjopm/article/view/V7N1A3 (Accessed: 25April2019).