YURCHENKO, O. I.; KALINENKO, O. S.; BAKLANOVA, L. V.; BAKLANOV, A. N.; DOBRIYAN, M. A.; CHERNOZHUK, T. V. Double frequency ultrasound at oils and fats sample preparation for detection of lead and cadmium. V. N. Karazin Kharkiv National University Bulletin. Chemical series, n. 24, p. 126-132, 28 Oct. 2014.