R. Pääkkönen and  L. Korpinen and  F. Gobba,  Comparing Measurements of UV Radiation in Winter and Summer in Finland.   journal   = {International Journal of Health and Medical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2018, vol. 135(3). 71 - 74
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/10008667.