SPECTROGRAPHIC DETERMINATION OF SMALL QUANTITIES OF LANTHANUM, PRASEODYMIUM, NE0DYMIUM AND YTTRIUM IN CERIUM
HSU PAO-LIN, SHEH LIEH-FANG, CHENG CHIEN-HWA, CHANG TING-CHAO
Acta Chimica Sinica . 1958, (6): 419 -425 .