Institution: | 1. Center for Discrete Mathematics, Fuzhou University, Number 89-1, Ruanjiantongpandadao, Fuzhou, Gulou District, Fujian, 350108, China 2. Institute of Statistics an Applied Mathmatics, Anhui University of Finance and Economics, Number 962, Caoshanroad, Bengbu, Longzihu District, Anhui, 233030, China
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