Knowledge production of firms: research networks and the "scientification" of business R&D. - David F. J. Campbell; Wolfgang H. Güttel (Int. J. Technol. Manag., 2005)

'Mode 3' and 'Quadruple Helix': toward a 21st century fractal innovation ecosystem. - Elias G. Carayannis; David F. J. Campbell (Int. J. Technol. Manag., 2009)

'Mode 3' universities and academic firms: thinking beyond the box trans-disciplinarity and nonlinear innovation dynamics within coopetitive entrepreneurial ecosystems. - Elias G. Carayannis; Evangelos Grigoroudis; David F. J. Campbell; Dirk Meissner; Dimitra Stamati (Int. J. Technol. Manag., 2018)