TY  - GEN
AU  - Krumholz,Mark R
AU  - McKee,Christopher F
TI  - A minimum column density of 1 g cm(-2) for massive star formation
SN  - 1476-4687
PY  - 2008///0331
N1  - Publication Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S
UR  - https://doi.org/10.1038/nature06620
ER  -