@article{article963b000d,
title   = {A semi-Markov multistate model for estimation of the mean quality-adjusted survival for non-progressive processes},
author = {Tunes, Gisela and Lima, Antonio Carlos Pedroso de and Sen, Pranab Kumar},
year = {2009},
doi = {10.1007%2Fs10985-008-9106-0},
journal   = {Lifetime Data Analysis}
}