1. X-ray spectrographical method for determination of rare earths;Aleksiev;Isvestija Geol. Inst. BAN.,1962
2. The rare earth elements;Aleksiev;Isdanie Nauka i Iskustvo,1965
3. On eliminating absorption errors in X-ray fluorescent analysis of rocks and minerals;Aleksiev;C.R. Acad. Bulgare Sci.,1965
4. Determination of scandium, yttrium, samarium and lanthanum in standard silicate rocks G-1 and W-1 by neutron activation analysis;Desai;Talanta,1964
5. Summary of new data on rock samples G-1 and W-1;Fleischer;Geochim. et Cosmochim. Acta,1961