Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral ArmDOI: info:10.3847/1538-4357/ab001av. 87494
Wu, Y. W., Reid, Mark J., Sakai, N., Dame, Thomas M., Menten, K. M., Brunthaler, A., Xu, Y., Li, J. J., Ho, B., Zhang, B., Rygl, K. L. J., and Zheng, X. W. 2019. "Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral Arm." The Astrophysical Journal, 874 94. https://doi.org/10.3847/1538-4357/ab001a.