Forrest, J. Y.-L., T. Tiglioglu, Y. Liu, D. Mong, and M. Cardin. “Various Convexities and Some Relevant Properties of Consumer Preference Relations”. Studia Universitatis Vasile Goldiș Arad, Seria Științe Economice, Vol. 33, no. 4, Oct. 2023, pp. 145-68, https://publicatii.uvvg.ro/index.php/studiaeconomia/article/view/771.