@article{Fu2000,
author = {Fu, W.J.},
title= {Ridge estimator in singular design with application to age-period-cohort analysis of disease rates},
year = {2000},
doi = {10.1080/03610920008832483},
journal = {Communications in Statistics-Theory and Method},
volume = {29},
number = {2},
pages = {263--278},
}