WASET
    Niklas Echterhoff and  Benjamin Amshoff and  Jürgen Gausemeier,  Cross-Industry Innovations–Systematic Identification of Ideas for Radical Problem Solving.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2013, vol. 74(2). 239 - 248
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/14910.