@article{Aalen2001,
author = {Aalen, O.O. and Gjessing, H.K. },
title= {Understanding the shape of the hazard rate: a process point of view},
year = {2001},
doi = {10.1214/ss/998929472},
journal = {Statistical Science},
volume = {16},
number = {1},
pages = {1--22},
}