@article{Rabe-Hesketh2004,
author = {Rabe-Hesketh, S. and Skrondal, A. and Pickles, A.},
title= {Generalized multilevel structural equation modeling},
year = {2004},
doi = {10.1007/BF02295939},
journal = {Psychometrika},
volume = {69},
number = {2},
pages = {167--190},
}