@book{Skrondal2004,
author = {Skrondal, A. and Rabe-Hesketh, S.},
title= {Generalized latent variable modelling: Multilevel, longitudinal, and structural equation models.},
year = {2004},
doi = {10.1201/9780203489437},
address = {Boca Raton},
publisher = {Chapman & Hall/CRC},
}