S. Petkova

In vitro regeneration and genetic transformation of common bean (Phaseolus vulgaris L.)—Problems and progress

M. Veltcheva, A. Perl, D. Svetleva, 2005 .

Iron and Sulfur Oxidation by Thiobacillus Ferrooxidans and Tolerance to Copper and Zinc Ions

V. Groudeva, S. Petkova, 1997 .