Metcheva, Roumiana; Yurukova, Lilyana; Teodorova, Svetla E. (2011-02-23). "Biogenic and toxic elements in feathers, eggs, and excreta of Gentoo penguin (Pygoscelis papua ellsworthii) in the Antarctic". Environmental Monitoring and Assessment. 182 (1–4): 571–585. doi:10.1007/s10661-011-1898-9. ISSN0167-6369. PMID21340549.
Beltcheva, Michaela; Metcheva, Roumiana; Peneva, Vesela; Marinova, Margarita; Yankov, Yordan; Chikova, Vania (2010-06-23). "Heavy Metals in Antarctic Notothenioid Fish from South Bay, Livingston Island, South Shetlands (Antarctica)". Biological Trace Element Research. 141 (1–3): 150–158. doi:10.1007/s12011-010-8739-5. ISSN0163-4984. PMID20571934.
Metcheva, Roumiana; Yurukova, Lilyana; Teodorova, Svetla E. (2011-02-23). "Biogenic and toxic elements in feathers, eggs, and excreta of Gentoo penguin (Pygoscelis papua ellsworthii) in the Antarctic". Environmental Monitoring and Assessment. 182 (1–4): 571–585. doi:10.1007/s10661-011-1898-9. ISSN0167-6369. PMID21340549.
Beltcheva, Michaela; Metcheva, Roumiana; Peneva, Vesela; Marinova, Margarita; Yankov, Yordan; Chikova, Vania (2010-06-23). "Heavy Metals in Antarctic Notothenioid Fish from South Bay, Livingston Island, South Shetlands (Antarctica)". Biological Trace Element Research. 141 (1–3): 150–158. doi:10.1007/s12011-010-8739-5. ISSN0163-4984. PMID20571934.
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Metcheva, Roumiana; Yurukova, Lilyana; Teodorova, Svetla E. (2011-02-23). "Biogenic and toxic elements in feathers, eggs, and excreta of Gentoo penguin (Pygoscelis papua ellsworthii) in the Antarctic". Environmental Monitoring and Assessment. 182 (1–4): 571–585. doi:10.1007/s10661-011-1898-9. ISSN0167-6369. PMID21340549.
Beltcheva, Michaela; Metcheva, Roumiana; Peneva, Vesela; Marinova, Margarita; Yankov, Yordan; Chikova, Vania (2010-06-23). "Heavy Metals in Antarctic Notothenioid Fish from South Bay, Livingston Island, South Shetlands (Antarctica)". Biological Trace Element Research. 141 (1–3): 150–158. doi:10.1007/s12011-010-8739-5. ISSN0163-4984. PMID20571934.