“…This subject has been investigated so intensively that it is impossible to give here a complete survey of all related studies of structure and transport properties of amorphous alloys in the vicinity of the MIT. Thus the following selection, listed according to the alloys investigated, contains merely the more important publications on low-temperature transport and, in some cases, structure: Ge-Al [27], Ge-Au [28][29][30], Ge-Co [31], Ge-Cu [32], Ge-Cr [31,[33][34][35], Ge-Fe [31,[36][37][38][39][40], Ge-Mn [31], Ge-Mo [40,41], Ge-Ni [31], Si-Au [42][43][44][45][46][47], Si-Cr [35,[48][49][50][51][52][53][54][55][56][57], Si-Fe [38,58,59], Si-Gd [60,61], Si-Mn [58,[62][63][64], Si-Nb …”