507, p. 573 article entitled "On the Use of Trigonometric Parallaxes for the Calibration of Luminosity Systems: Theory." although it was known following the work of Trumpler & Weaver in 1953.
In 1953, Trumpler and Weaver's work established that a method using trigonometric parallaxes could be used to calibrate luminosity systems. This article, published on page 573 of volume 507, explores this theory.