@article{hahn_mcdaniel_wilk_1984, title={GENETIC AND ENVIRONMENTAL VARIATION OF HOOF CHARACTERISTICS OF HOLSTEIN CATTLE}, volume={67}, ISSN={["0022-0302"]}, DOI={10.3168/jds.S0022-0302(84)81664-1}, number={12}, journal={JOURNAL OF DAIRY SCIENCE}, author={HAHN, MV and MCDANIEL, BT and WILK, JC}, year={1984}, pages={2986–2998} }
 @article{hahn_1980, title={Studies of genetic and environmental characteristics of hooves of dairy cattle}, volume={40}, number={10}, journal={Dissertation Abstracts International. B, Sciences and Engineering}, author={Hahn, M. V.}, year={1980}, pages={4578} }