TY  - RPRT
TI  - The classification of the complex primitive infinite pseudogroups.
AU  - V Guillemin
AU  - D Quillen
AU  - S Sternberg
PY  - 1966
DO  - 10.1073/pnas.55.4.687
UR  - https://pubmed.ncbi.nlm.nih.gov/16591345/
ID  - 16591345
ER  -