Henken, AMGraat, EAMCasal, J2025-03-142025-03-141997https://rivm.openrepository.com/handle/10029/637028ArticleIn: Noordhuizen JPTM, Frankena K, Hoofd CM van der, Graat EAM. Application of quantitative methods in veterinary epidemiology. Wageningen: Wageningen Pers, 1997;64-972025-03-14