@article{Van den Hout2008,
author = {Van den Hout, A. and Matthews, F.E.},
title= {Multi-state analysis of cognitive ability data: a piecewise-constant model and a Weibull model},
year = {2008},
doi = {10.1002/sim.3360},
journal = {Statistics in Medicine},
volume = {27},
pages = {5440--5455},
}