Srivastava, Radhendushka, Ping Li, and Debasis Sengupta. "Testing for Membership to the IFRA and the NBU Classes of Distributions." Journal of Machine Learning Research - Proceedings Track for the Fifteenth International Conference on Artificial Intelligence and Statistics (AISTATS 2012) 22 (2012): 1099-1107, available at http://jmlr.csail.mit.edu/proceedings/papers/v22/srivastava12.html.