WASET
    Ilma Robo and  Saimir Heta and  Nedja Hysi and  Vera Ostreni,  Analysis of Cross-Sectional and Retrograde Data on the Prevalence of Marginal Gingivitis.   journal   = {International Journal of Medical and Health Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2020, vol. 166(10). 306 - 312
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10011509.