“…For example, the traveling wave solutions were investigated in [12,19,32], the chaotic properties of solutions were examined in [10,11], and the asymptotic behavior of solutions was studied in [1,2,5,7,23,24,27,[29][30][31]. For the study of long-time behavior of partial differential equations on unbounded domain, we refer readers to [3,4,17,25,28].…”