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J.V.G.A. Durnin, J. Womersley (1973) "Body fat assessed from total body density and its estimation from skinfold thickness : measurements on 481 men and women aged from 16 to 72 years" Journal of Nutrition (http://journals.cambridge.org/download.php?file=%2FBJN%2FBJN32_01%2FS0007114574000614a.pdf&code=2ae91e414b714b0b28e851f47f408cbf)