Sorina Adriana Mitrea and  Silvia Maria Hodorogea and  Anca Duta and  Luminita Isac and  Elena Purghel and Mihaela Voinea,  Some Aspects Regarding I. R. Absorbing Materials Based On Thin Alumina Films for Solar-Thermal Energy Conversion, Using X-Ray Diffraction Technique.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2008, vol. 23(11). 334 - 337
    [viewed 29 January 2020]. Available from: https://publications.waset.org/pdf/5399.