Kesselring, M., Ruiz-Coupeau, S., Kirsch, M., Wagner, F., & Gloaguen, R. 2021. Integrated Test Sites for Innovation Ecosystems. Technology Innovation Management Review, 11(7/8): 20-32. http://doi.org/10.22215/timreview/1454

Wohlfart, L., Bünger, M., Lang-Koetz, C., & Wagner, F. 2016. Corporate and Grassroot Frugal Innovation: A Comparison of Top-Down and Bottom-Up Strategies. Technology Innovation Management Review, 6(4): 5-17. http://doi.org/10.22215/timreview/977