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8. Marieb 2004, p. 237
9. Tubiana, Thomine & Mackin 1998, p. 4
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28. Tocheri et al. 2008
29. Reardon 2012, Knight 2012, Morgan & Carrier 2013
30. Key and Lycett, 2011
31. williams et al., 2012
32. Key, 2013
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