Investigation of LA/Ac colorimetric method for the determination of airborne fluoridesLuiga, Peeter; Liiv, Reet; Ott, RomanJournal of the Air Pollution Control Association: JAPCA ; the internat. journal of air pollution control and waste management1972 / p. 409-416

Кумулятивное определение двуокиси серы и фторидов в атмосферном воздухеLiiv, Reet; Ott, Roman; Luiga, Peeter; Pikkov, ValentinEesti NSV Teaduste Akadeemia toimetised. Keemia. Geoloogia = Известия Академии наук Эстонской ССР. Химия. Геология1974 / с. 208-213 https://www.ester.ee/record=b1264554*es https://www.etera.ee/zoom/18995/view?page=1&p=separate&tool=info