Bkr, M., A. Youssef S. E, and B. M.E. “NONPARAMETRIC TEST FOR UBACT CLASS OF LIFE DISTRIBUTION BASED ON U-STATISTIC”. JOURNAL OF ADVANCES IN MATHEMATICS, vol. 11, no. 2, Aug. 2015, pp. 4002-11, doi:10.24297/jam.v11i2.1275.