TY  - RPRT
TI  - Evolution of CAM and C 4 carbon-concentrating mechanisms
AU  - Jon E. Keeley
AU  - Philip W. Rundel
PY  - 2003
DO  - 10.1086/374192
UR  - https://pubs.usgs.gov/publication/1008348
ID  - 1008348
ER  -