Long-term monitoring of anthropogenic impacts from the brazilian antarctic station "Comandante Ferraz" (King George Island) Isotopic analysis of C and N - Corbisier, Thais Navajas; Bromberg, Sandra; Gheller, Paula Foltran; Ujikawa, Maria Claúdia Yuri; Petti, Mônica Angélica Varella (Annual Activity Report. INCT/APA (print), 2013)