Sobral, Marcos, Ana Paula Costa, and Adiel Almeida Filho. 2010. “Multi-Criteria Model for Classifying Clients of Companies Distributing Liquefied Petroleum Gas”. Brazilian Journal of Operations & Production Management 7 (1), 53-75. https://bjopm.emnuvens.com.br/bjopm/article/view/V7N1A3.