ABOUAMMOH, A.M., AHMED, A.N. and KHALIQUE, A. 1990. PARTIAL ORDERINGS OF LIFE DISTRIBUTIONS BASED ON AGEING PROPERTIES. Tamkang Journal of Mathematics. 21, 1 (Mar. 1990), 21–33. DOI:https://doi.org/10.5556/j.tkjm.21.1990.4642.