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V Elbrecht, A Fomina, R Koch, R Koch, E Realo, H Taal, R Veski. "ИССЛЕДОВАНИЕ ХИМИЧЕСКИХ СЫРЬЕВЫХ КАЧЕСТВ БОЛГАРСКОГО ГОРЮЧЕГО СЛАНЦА МЕСТОРОЖДЕНИЯ KРАСАВА I. ОБЩАЯ ХАРАКТЕРИСТИКА СЛАНЦА И БИТУМОИДОВ." Proceedings of the Academy of Sciences of the Estonian SSR. Chemistry 33.3 (1984) 155