Highly siderophile element depletion in the Moon
James M.D. Day, Richard J. Walker Earth and Planetary Science Letters Volume 423, 1 August 2015, Pages 114–124 doi:10.1016/j.epsl.2015.05.001 LINK
Highly Siderophile Elements and 187Re-187Os Isotopic Systematics of the Allende Meteorite: Evidence for Primary Nebular Processes and Late-stage Alteration
Archer GJ, Ash RD, Bullock ES and Walker RJ Geochimica et Cosmochimica Acta Volume 131, 15 April 2014, Pages 402–414 LINK