Oliveira, Sanderson L. Gonzaga de, and Maurício Kischinhevsky. 2010. “Time Complexity of Algorithms That Update the Sierpinski-Like and Modified Hilbert Curves”. INFOCOMP Journal of Computer Science 9 (1):90-97. https://infocomp.dcc.ufla.br/index.php/infocomp/article/view/295.