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FLAVONOIDS FROM PHLOMIS NISSOLII

M. Schubert-Zsilavecz, F. Bucar, T. Kartnig, 1998 .

Chemical composition of the roots of Gentiana asclepiadea

G. Kitanov, I. Asenov, D. Van, 1991, Chemistry of Natural Compounds.

Successive Determination of pH and Ammonical Nitrogen in Soil Samples

Vasil Simeonov, V. Simeonov, I. Asenov, 1976 .