TY  - RPRT
TI  - A method for fitting regression splines with varying polynomial order in the linear mixed model.
AU  - Lloyd J Edwards
AU  - Paul W Stewart
AU  - James E MacDougall
AU  - Ronald W Helms
PY  - 2006
DO  - 10.1002/sim.2232
UR  - https://pubmed.ncbi.nlm.nih.gov/16158407/
ID  - 16158407
ER  -