Pandiyarajan Thangaraj and  Mangalaraja Ramalinga Viswanathan and  Karthikeyan Balasubramanian and  Héctor D. Mansilla and  José Ruiz and  David Contreras,  Structural and Optical Properties of Pr3+ Doped ZnO and PVA:Zn98Pr2O Nanocomposite Free Standing Film.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2015, vol. 97(1). 225 - 229
    [viewed 22 May 2022]. Available from: https://publications.waset.org/pdf/10000940.