@article{Block2003,
author = {Block, H.W. and Li, Y. and Savtis, T.H.},
title= {Initial and final behavior of failure rate functions for mixtures and functions},
year = {2003},
doi = {10.1239/jap/1059060898},
journal = {Journal of Applied Probability},
volume = {40},
number = {3},
pages = {721--740},
}