TY  - RPRT
TI  - A simple analytic approximation for dusty Stroemgren spheres
AU  - Petrosian, V.
AU  - Silk, J.
AU  - Field, G. B.
PY  - 1972
UR  - https://ntrs.nasa.gov/citations/19720026125
ID  - 19720026125
ER  -