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2. Official Methods of Analysis;AOAC,1984
3. Changes in nutritive nitrogen in raw and boiled potatoes;Bečka;Rostlina Vyroba,1982
4. The influence of differential fertilization on the yield and contents of macroelements and amino acids of potato tubers;Ciecko;Rolnictwo,1977
5. Influence of ashing techniques on the analysis of trace elements in animal tissue;Clegg;Biol. Trace Elem. Res.,1981