Biblio
“HEAVY METAL UPTAKE BY MINT”, Acta Horticulturae, no. 500, pp. 111 - 118, 1999.
, “Influence of some biologically active substances on the productivity of winter wheat cultivar Gergana”, Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 39, pp. 247-250, 1994.
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