@book{Aalen2008,
author = {Aalen, O.O. and Borgan, Ø. and Gjessing, H.K.},
title= {Survival and event history analysis. A process point of view},
year = {2008},
doi = {10.1007/978-0-387-68560-1},
address = {New York},
publisher = {Springer},
}