Trigonometric Parallaxes of Massive Star-Forming Regions. I. S 252 & G232.6+1.0v. 693397–405
Reid, Mark J., Menten, Karl M., Brunthaler, A., Zheng, X. W., Moscadelli, L., and Xu, Y. 2009. "Trigonometric Parallaxes of Massive Star-Forming Regions. I. S 252 & G232.6+1.0." The Astrophysical Journal, 693 397–405.