546.422 Rya A Ryabchikov , D I Analytical chemistry of thorium (Th) (by) D. I. Ryabchikov (and) E. K. Gol´braikh. Jerusalem , Israel Program for Scientific Translations , 1963 250 p. diagrs. , tablas 25 cm.(Series : Analytical chemistry of elements " A la cabeza del título : " Academy of Sciences of the U.R.S.S.R Vernadskii Institute of Geohemistry and Analytical Chemistry" " Bibliography " : p. 199- 240