S.D. Emslie & W.P. Patterson. Abrupt recent shift in δ13C and δ15N values in Adélie penguin eggshell in Antarctica. Proc. Natl Acad. Sci. USA. July 2007, 104 (28): 11666–11669. PMID 17620620. doi:10.1073/pnas.0608477104.
S.D. Emslie & W.P. Patterson. Abrupt recent shift in δ13C and δ15N values in Adélie penguin eggshell in Antarctica. Proc. Natl Acad. Sci. USA. July 2007, 104 (28): 11666–11669. PMID 17620620. doi:10.1073/pnas.0608477104.