BibTex format
@article{Laird:1992:10.1177/096228029200100302,
author = {Laird, NM and Donnelly, C and Ware, JH},
doi = {10.1177/096228029200100302},
journal = {Stat Methods Med Res},
pages = {225--247},
title = {Longitudinal studies with continuous responses.},
url = {http://dx.doi.org/10.1177/096228029200100302},
volume = {1},
year = {1992}
}