Tim Engartner,  Overcoming Boundaries in Science – A Plea against Political Isolations.   journal   = {International Journal of Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology.
    July 2009, vol. 31(7). 1429 - 1432
    [viewed 28 January 2020]. Available from: https://publications.waset.org/pdf/1372.