The U-Th-Pb system compared in coexisting zircon, monazite and xenotime [abs.]

Williams, I.S., and Silver, L.T., 1979, The U-Th-Pb system compared in coexisting zircon, monazite and xenotime [abs.]: Eos, Transactions, American Geophysical Union, v. 60, no. 18, p. 411.