RARE EARTH ANALYSIS OF USGS ROCKS SCO-1 AND STM-1. EVALUATION OF STANDARDS FOR HOMOGENEITY AND OF THE PRECISION AND ACCURACY OF A PROCEDURE FOR NEUTRON ACTIVATION ANALYSIS.KOSIEWICZ ST; SCHOMBERG PJ; HASKIN LA et al.1974; J. RADIOANAL. CHEM.; NLD; 1974, VOL. 20, NUM. 0002, P. 619 A 626Serial Issue

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