Thiel, Tomasz. “A Proposal of Defining Participant Preferences in a Decision Aiding Process With the Participant Representing a Collective Body”. Technological and Economic Development of Economy 12, no. 3 (September 30, 2006): 257-262. Accessed November 22, 2019. https://journals.vgtu.lt/index.php/TEDE/article/view/8000.