XPS and TPR study of sol-gel derived M/TiO2 powders (M=Co, Cu, Mn, Ni) - I. S. Petrik; G. V. Krylova; O. O. Kelyp; L. V. Lutsenko; N. P. Smirnova; L. P. Oleksenko (Chemistry, physics and technology of surface, 2015)