TY  - RPRT
TI  - Programmed Instruction Nucleus (PIN): a simplified author-language for computer-aided instruction.
AU  - A B Forsythe
AU  - J R Freed
AU  - H S Frey
PY  - 1975
DO  - 10.1016/0010-4825(75)90020-7
UR  - https://pubmed.ncbi.nlm.nih.gov/1098845/
ID  - 1098845
ER  -