Seroprevalence and Associated Risk Factors of Bovine Brucellosis in District Gujranwala, Punjab, Pakistan oleh Muhammad Rashid Khan, Abdul Rehman, Salman Khalid, Mansur Ud Din Ahmad, Muhammad Avais, Mobeen Sarwar, Farhat Nazir Awan, Falk Melzer, Heinrich Neubauer, Tariq Jamil