chemical Abstracts, vol. 68 (1968) Item 104540w, abstracting Aarna et al. in "Eesti NSV Tead. Akad. Toim., Keem., Geol." vol. 16, No. 4, pp. 300-306 (1967) (Aarna et al. I). |
Chemical Abstracts, vol. 71 (1969) Item 49439e, abstracting Aarna in "Suom., Kemistilehti B" 1969, vol. 42, No. 4, pp. 217-120 (Aarna et al. II). |
Chemical Abstracts, vol. 73 (1970) Item 76347w, abstracting Aarna et al. in "Eesti NSV Tead. Akad. Tiom., Keam., Geol." (1970) vol. 19, No. 2, pp. 121-127 (Aarna et al. III). |
Chemical Abstracts, vol. 57 (1962) Col. 16550, abstracting Burmistrov et al. in "Tr. Dnepropetr. Khim.-Teknnol. Inst." (1959) Pt. 1, No. 12, pp. 153-157. |