@article{Longini1989,
author = {Longini, I. and Scott Clark, W. and Byers, R. and Ward, J.W. and Darrow, W.W. and Lemp, G.F. and Hethcote, H.W.},
title= {Statistical analysis of the stages of HIV infection using a Markov model},
year = {1989},
doi = {10.1002/sim.4780080708},
journal = {Statistics in Medicine},
volume = {8},
number = {7},
pages = {831--843},
}