TY  - RPRT
TI  - Estimation of multivariate frailty models using penalized partial likelihood.
AU  - S Ripatti
AU  - J Palmgren
PY  - 2000
DO  - 10.1111/j.0006-341x.2000.01016.x
UR  - https://pubmed.ncbi.nlm.nih.gov/11129456/
ID  - 11129456
ER  -