“…IkehataTanizawa [12] consider the global existence part for noncompactly supported data. There are many related results to the so-called di¤usion phenomenon, and we quote some of them below: Han-Milani [4], Ikehata [7], IkehataMiyaoka-Nakatake [8], Ikehata-Nishihara [9], Ikehata-Ohta [11], HosonoOgawa [5], Marcati-Nishihara [20], Nishihara [25,26], Li-Zhou [18], Narazaki [24], Zhang [41], and the references there in.…”