E. Theodosoglou, A. Koroneos, T. Soldatos, T. Zorba, and K. M. Paraskevopoulos, “COMPARATIVE FOURIER TRANSFORM INFRARED AND X-RAY POWDER DIFFRACTION ANALYSIS OF NATURALLY OCCURRED K-FELDSPARS”, geosociety, vol. 43, no. 5, pp. 2752–2761, Jan. 2010.