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^ a b cThomas L. Lemke; David A. Williams (24 January 2012). Foye's Principles of Medicinal Chemistry. Lippincott Williams & Wilkins. pp. 336–337. ISBN 978-1-60913-345-0.
^Alexandra Dugdale (28 November 2011). Veterinary Anaesthesia: Principles to Practice. John Wiley & Sons. pp. 144–. ISBN 978-1-118-27933-5.