Citation: Ca. Nogueira et Amg. Figueiredo, DETERMINATION OF PLATINUM, PALLADIUM, IRIDIUM AND GOLD IN SELECTED GEOLOGICAL REFERENCE MATERIALS BY RADIOCHEMICAL NEUTRON-ACTIVATION ANALYSIS - COMPARISON OF PROCEDURES BASED ON AQUA REGIA LEACHING AND SODIUMPEROXIDE SINTERING, Analyst, 120(5), 1995, pp. 1441-1443