TY  - RPRT
TI  - SYTLYN - a program for sight line calculation.
AU  - R F Penn
AU  - D G Davies
PY  - 1973
DO  - 10.1016/0003-6870(73)90009-4
UR  - https://pubmed.ncbi.nlm.nih.gov/15677115/
ID  - 15677115
ER  -