1. Bailer-Jones C. A. L. , Smith K. S. , 2008a, Gaia DPAC Technical Note, GAIA-C8-TN-MPIA-CBJ-036 (http://www.mpia.de/GAIA/)
2. Bailer-Jones C. A. L. , Smith K. S. , 2008b, Gaia DPAC Technical Note, GAIA-C8-TN-MPIA-CBJ-037 (http://www.mpia.de/GAIA/)
3. Robust Machine Learning Applied to Astronomical Data Sets. I. Star‐Galaxy Classification of the Sloan Digital Sky Survey DR3 Using Decision Trees
4. Brown A. G. A. , 2006, Gaia DPAC Technical Note, GAIA-CA-TN-LEI-AB-005