Trigonometric parallaxes of massive star forming regions: G012.88+0.48 and W33DOI: info:10.1051/0004-6361/201220793v. 553EDP Sciences117
Immer, K., Reid, M. J., Menten, K. M., Brunthaler, A., and Dame, T. M. 2013. "Trigonometric parallaxes of massive star forming regions: G012.88+0.48 and W33." Astronomy and Astrophysics, 553 117. https://doi.org/10.1051/0004-6361/201220793.