Kyvsgaard NC, Lindbom J, Andreasen LL, Luna-Olivares LA, Nielsen MK, Monrad J. Prevalence of strongyles and efficacy of fenbendazole and ivermectin in working horses in El Sauce, Nicaragua. Vet Parasitol. 2011 Sep 27;181(2-4):248–54. doi: 10.1016/j.vetpar.2011.04.002. PMID: 21570188.