“…Later, however, the issue was resolved in the context of the finite physical dimension of the source size, which leads to the beam-reformation via the time-of-flight effects. Thus, the propagation and relaxation of type III electrons either in homogeneous and inhomogeneous media, with or without the effects of finite source size, i.e., the time-of-flight effects, together with the excitation and saturation of Langmuir turbulence, have received extensive discussions in the literature (Sturrock 1964;Zheleznyakov & Zaitsev 1970b;Zaitsev et al 1972;Papadopoulos et al 1974Papadopoulos et al , 1975Takakura & Shibahashi 1976;Magelssen & Smith 1977;Goldstein et al 1979;Smith et al 1979;Grognard 1980Grognard , 1982Grognard , 1985Muschietti 1990;Mel'nik et al 1999;Kontar 2001aKontar , 2001bKontar , 2001cKontar & Pécsely 2002;Ziebell et al 2001Ziebell et al , 2008aZiebell et al , 2008bZiebell et al , 2012Ziebell et al , 2014aZiebell et al , 2014bZiebell et al , 2014cLi et al 2003Li et al , 2005aLi et al , 2005bLi et al , 2006aLi et al , 2006bLi et al , 2006cLi et al , 2008aLi et al , 2008bLi et al , 2009Li et al , 2010Li et al , 2011aLi et al , 2011bLi et al , 2011c…”