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Widmer, A.; Doherr, M.G.; Tessier, C.; Koch, C.; Ramseyer, A.; Straub, R.; Gerber, V. (2009). Association of increased tracheal mucus accumulation with poor willingness to perform in show-jumpers and dressage horses. Veterinary journal, 182(3), pp. 430-5. Amsterdam: Elsevier 10.1016/j.tvjl.2008.08.015
