Institution: | 1.School of Mathematics Science, Tianjin Normal University, Tianjin, 300387, China ;2.School of Mathematics and Systems Science and LMIB, Beihang University, Beijing, 100191, China ;3.School of Statistics and Mathematics, Inner Mongolia University of Finance and Economics, Hohhot, 010070, China ;4.Inner Mongolia Key Laboratory for Economic Data Analysis and Mining, Hohhot, 010070, China ; |