Broekman, LE; Kuiper, D (December 2002). «Megaesophagus in the horse. A short review of the literature and 18 own cases». The Veterinary Quarterly24 (4): 199-202. PMID12540136. doi:10.1080/01652176.2002.9695136.
Ploeg, M; Gröne, A; Saey, V; de Bruijn, CM; Back, W; van Weeren, PR; Scheideman, W; Picavet, T et al. (November 2015). «Esophageal dysfunction in Friesian horses: morphological features». Veterinary Pathology52 (6): 1142-7. PMID25367366. doi:10.1177/0300985814556780.Se sugiere usar |número-autores= (ayuda)
Broekman, LE; Kuiper, D (December 2002). «Megaesophagus in the horse. A short review of the literature and 18 own cases». The Veterinary Quarterly24 (4): 199-202. PMID12540136. doi:10.1080/01652176.2002.9695136.
Ploeg, M; Gröne, A; Saey, V; de Bruijn, CM; Back, W; van Weeren, PR; Scheideman, W; Picavet, T et al. (November 2015). «Esophageal dysfunction in Friesian horses: morphological features». Veterinary Pathology52 (6): 1142-7. PMID25367366. doi:10.1177/0300985814556780.Se sugiere usar |número-autores= (ayuda)