TY  - RPRT
TI  - A two-level cross-sectional model using grafted polynomials.
AU  - H Q Pan
AU  - H Goldstein
AU  - G Di
DO  - 10.1080/03014469200002212
UR  - https://pubmed.ncbi.nlm.nih.gov/1616289/
ID  - 1616289
ER  -