TY  - RPRT
TI  - Abstract Flat Projective Geometry.
AU  - A D Michal
AU  - A B Mewborn
PY  - 1939
DO  - 10.1073/pnas.25.8.440
UR  - https://pubmed.ncbi.nlm.nih.gov/16577932/
ID  - 16577932
ER  -