@article{Tetsuji Tonda2017, title={Estimating Varying Coefficients for Longitudinal Data without Specifying Spatial-Temporal Baseline Trend}, author={Tetsuji Tonda and Kenichi Satoh}, journal={JOURNAL OF THE JAPAN STATISTICAL SOCIETY}, volume={47}, number={1}, pages={1-12}, year={2017}, doi={10.14490/jjss.47.1} }