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Technological Forecasting and Social Change > 2019 > 138 > C > 78-94
Builder > 2017 > R.21, nr 11 > 82--84
Journal of the Knowledge Economy > 2015 > 6 > 2 > 296-319
MSIE 2011 > 1269 - 1272
Research Policy > 2002 > 31 > 2 > 213-231