TY  - RPRT
TI  - Absolute magnitude calibration using trigonometric parallax - Incomplete, spectroscopic samples
AU  - Ratnatunga, Kavan U.
AU  - Casertano, Stefano
PY  - 1991
UR  - https://ntrs.nasa.gov/citations/19910042706
ID  - 19910042706
ER  -