↑ Newton, Lisa A.; Chilton, Neil B.; Beveridge, Ian; Gasser, Robin B. (1998-11-01). "Systematic relationships of some members of the genera Oesophagostomum and Chabertia (Nematoda: Chabertiidae) based on ribosomal dna sequence datafn1" . International Journal for Parasitology . 28 (11): 1781– 1789. doi : 10.1016/S0020-7519(98)00144-1 . ISSN 0020-7519 .