@book{Hosmer1998,
author = {Hosmer, D. and Lemeshow, S.},
title= {Applied survival analysis},
year = {1998},
doi = {10.1002/9780470258019},
URL = {http://dx.doi.org/10.1002/9780470258019},
address = {New York},
publisher = {John Wiley & Sons},
}