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http://www.aipvet.it/APIVMeetings/2003_ATTI_APIV/vascellarireprint2003.PDF
http://www.antichips.com/cancer/06-palmer-1998.pdf
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http://www.bioone.org/doi/abs/10.1638/1042-7260%282007%29038%5B0352%3AMLIAEF%5D2.0.CO%3B2