Trace elements in phosphate rock and fertilizersViisimaa, Ludmilla; Veiderma, Mihkel; Hödrejärv, HelviAnalytical sciences1991 / p. 1161-1163 Trace elements in phosphate rock and fertilizersViisimaa, Ludmilla; Veiderma, Mihkel; Hödrejärv, HelviInternational Congress on Analytical Sciences 1991 (IUPAC ICAS'91) : abstracts, Chiba, Japan, 25-31 August 19911991 / p. 320