EXTRACTION DU BE PAR LA N-BENZOYLPHENYL-HYDROXYLAMINE DOSAGE PHOTOMETRIQUE ET SPECTROGRAPHIQUE DU BE DANS LES SILICATES.MAREVA S; PUZDRENKOVA IV; STOJANOVA C et al.1967; IZVEST.INST.OBSHTA.NEORG.KHIM.SOFIJA; BGR; 1967, VOL. 5, P. 5 A 12Miscellaneous

RARE ELEMENTS IN THE VOLCANIC COMPLEXES OF THE CENTRAL AND WESTERN PARTS OF THE RHODOPE CENTRAL MASSIF IN BULGARIA.IVANOV R; STEFANOVA D; KAMBUROVA R et al.1969; IZVEST. GEOL. INST., GEOKHIM. MINERAL. PETROGR., SOFIJA; BGR; 1969, VOL. 18, P. 67 A 87Miscellaneous