TY  - RPRT
TI  - Model selection techniques for the covariance matrix for incomplete longitudinal data.
AU  - J J Grady
AU  - R W Helms
PY  - 1995
DO  - 10.1002/sim.4780141302
UR  - https://pubmed.ncbi.nlm.nih.gov/7481180/
ID  - 7481180
ER  -