Affiliation: | 1. Department of Mathematics, North University of China, Taiyuan, Shan’xi, 030051, People’s Republic of China 2. The Laboratory of Animal Epidemiological Surveillance, China Animal Health and Epidemiology Center, Qingdao, Shandong, 266032, People’s Republic of China 3. Department of Mathematics, University of Miami, Coral Gables, FL, 33124-4250, USA
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