VirchenkoY. P., and TolmachevaY. A. “Majorant Estimates for the Percolation Threshold of a Bernoulli Field on a Square Lattice”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 57, no. 10, Oct. 2005, pp. 1315–1326, https://umj.imath.kiev.ua/index.php/umj/article/view/3687.