G. R. Guedes, P. C. L. Siviero, A. J. Caetano, C. J. Machado, and E. Brondízio, “Incorporating variability in the process of identification of the global maximum model in Grade of Membership (GoM): methodological considerations”, Rev. bras. estud. popul., vol. 28, no. 2, pp. 337–347, Dec. 2011.