Introduction. Ternary Systems: Al-Cu-Li, Al-Cu-Ru, Be-Cu-Mg, Be-Cu-Ni, Be-Cu-Si, Ce-Cu-Ge, Ce-Cu-In, Ce-Cu-Ni, Ce-Cu-Si, Ce-Cu-Sn, Ce-Cu-Zn, Co-Cu-Si, Co-Cu-Sm, Cr-Cu-Fe, Cr-Cu-Ni, Cr-Cu-Si, Cr-Cu-Zr, Cu-Fe-Pt, Cu-Ga-Mn, Cu-Gd-Sn, Cu-Ge-Mn, Cu-Ge-Ni, Cu-H-Ni, Cu-In-Yb, Cu-La-Ni, Cu-Mg-Zr, Cu-Mn-Si, Cu-Mn-Zn, Cu-Nb-Si, Cu-Nb-Sn, Cu-Ni-Si, Cu-Ni-Zr, Cu-Pb-Sb, Cu-Pb-Zn, Cu