Drupal-Bibcite0<style face="normal" font="default" size="100%">The effect of bovine viral diarrhoea virus on fertility in dairy cows: two case-control studies in the province of Styria, Austria</style><style face="normal" font="default" size="100%">The effect of bovine viral diarrhoea virus on fertility in dairy cows: two case-control studies in the province of Styria, Austria</style>