1. Fractionation in the solar nebula: condensation of yttrium and the rare earth elements;Boynton;Geochim. Cosmochim. Acta,1975
2. The chaotic solar nebula: evidence for episodic condensation in several distinct zones;Boynton,1978
3. Cosmochemistry of the rare earth elements: meteorite studies;Boynton,1983
4. Identification of an ultra-refractory component in the Murchison meteorite;Boynton,1980
5. Abundances of the elements in the solar system;Cameron;Space Sci. Rev.,1973