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<p><span style="font-size: small"> 1. <span class="reference-text"><span class="citation book">Winkler, HL (1920). <i>Verbreitung und Ursache der Parthenogenesis im Pflanzen- und Tierreiche</i>. Jena: Verlag Fischer.</span></span></span></p>
<p><span style="font-size: small"><span class="reference-text"><span class="citation book"> 2. World Health Organization (2014). Cancer Fact sheet N<sup>0</sup>297<sup>''</sup></span></span></span></p>
<p><span style="font-size: small"><span class="reference-text"><span class="citation book"> 3. Tomasetti C, Vogelstein B (2015). </span><em><span class="citation book">Variation in cancer risk among tissues can be explained by the number of stem cell divisions.</span></em></span></span></p><p><span style="font-size: small">Science</span class="reference-text"><em/p><p><span classstyle="citation bookfont-size: small"> 4. <a href="http://www.hopkinsmedicine.org/news/media/releases/spanbad_luck_of_random_mutations_plays_predominant_role_in_cancer_study_shows"><http://www.hopkinsmedicine.org/news/media/releases/em>bad_luck_of_random_mutations_plays_predominant_role_in_cancer_study_shows</spana></span></p>
