@article{Eilers1996,
author = {Eilers, P.H.C. and Marx, B.D.},
title= {Flexible Smoothing with B-splines and Penalties},
year = {1996},
doi = {10.1214/ss/1038425655},
journal = {Statistical Sciences},
volume = {11},
number = {2},
pages = {89--121},
}