1. Amino acid composition of potato tubers as influenced by nitrogen and potassium fertilization, year, location and variety;Baerug;Meld. Norg. Landbr. Hëgsk.,1979
2. Nitrogen fertilization of potato variety—Flisak. II. Influence of nitrogen fertilization on yield and chemical composition of tubers;Ciećko;Zesz. nauk. ART Olszt. Rolnictwo,1974
3. Effects of drought periods and two nitrogen levels on the potato variety ‘Saphir’;Dragland;Forskn. Fors. Landbr.,1978
4. Sostav belkov klubniej kartofela pri razlic̆nych uroviach mineralnovo pitania;Kiriuchin;Fizjol. i biochim. kult. rast.,1986
5. Critical estimation of the starch content determination methods in potato tubers;Leszczyński;Przem. Ferm. Rol.,1975