R. DUDRIC, I. G. DEAC, M. NEUMANN, and R. TETEAN, “XPS INVESTIGATIONS OF La₀.₆₇Sr₀.₃₃Co₁₋ₓMnₓO₃ COMPOUNDS”, Studia UBB Physica, vol. 61, no. 1, pp. 27–34, Jun. 2016.