Proschowsky, H. F.; Rugbjerg, H.; Ersbøll, A. K. R. (2003). "Mortality of purebred and mixed-breed dogs in Denmark". Preventive Veterinary Medicine. 58 (1–2): 63–74. DOI:10.1016/S0167-5877(03)00010-2. PMID12628771.
Proschowsky, H. F.; Rugbjerg, H.; Ersbøll, A. K. R. (2003). "Mortality of purebred and mixed-breed dogs in Denmark". Preventive Veterinary Medicine. 58 (1–2): 63–74. DOI:10.1016/S0167-5877(03)00010-2. PMID12628771.