[1]
J. Flores-Camacho, O. Núñez-Olvera, G. Rodríguez-Pedroza, A. Lastras Martínez, and L. Lastras-Martínez, Lock-in amplifier-based rotating-analyzer spectroscopic ellipsometer with micro-controlled angular frequency, Rev. Mex. Fís. 51, (2005).