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POLITO, M.J., CLUCAS, G.V., HART, T. & TRIVELPIECE, W.Z. (2012). A simplified method of determining the sex of Pygoscelis penguins using bill measurements
        Marine Ornithology, 40(2), 
        89-94.
        
        http://doi.org/10.5038/2074-1235.40.2.974
      
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