Linda T. Elkins-Tanton, Asteroids, Meteorites, and Comets, 2010:10 "Is it a coincidence that most of the planets fall within the Titius-Bode law's boundaries?". astronomy.com.
Truy cập ngày 20 tháng 4 năm 2007.  ^ Linda T. Elkins-Tanton, Asteroids, Meteorites, and Comets, 2010:10 ^ “Is it a coincidence that most of the planets fall within the Titius-Bode law's boundaries?”. astronomy.com.