TY  - RPRT
TI  - Relative risk, risk difference and rate difference models for sparse stratified data: a pseudo likelihood approach.
AU  - T Stijnen
AU  - H C Van Houwelingen
PY  - 1993
DO  - 10.1002/sim.4780122406
UR  - https://pubmed.ncbi.nlm.nih.gov/8134733/
ID  - 8134733
ER  -