shah, Parag B., and C. D. Bhavsar. “Two-Piece Multivariate Lognormal Distribution”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 15, no. 1, Apr. 2014, pp. 164-70, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/2066.