WASET
    J. Trarbach and  S. Schosser and  B. Vogt,  Payment for Pain: Differences between Hypothetical and Real Preferences.   journal   = {International Journal of Medical and Health Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2017, vol. 126(6). 371 - 374
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10007412.