Mitrea, S. , Hodorogea, S. , Duta, A. , Isac, L. , Purghel, E. , Voinea, M.. "Some Aspects Regarding I. R. Absorbing Materials Based On Thin Alumina Films for Solar-Thermal Energy Conversion, Using X-Ray Diffraction Technique". World Academy of Science, Engineering and Technology, Open Science Index 23, International Journal of Materials and Metallurgical Engineering, (2008), 2(11), 346 - 349.