Peters, B., Riley, R., Siedschlag, I., Vahter, P., and McQuinn, J. (2018). Internationalisation, innovation and productivity in services: evidence from Germany, Ireland and the United Kingdom, Review of World Economics, Vol. 154, Issue 3, August 2018, pp. 585-615, https://doi.org/10.1007/s10290-018-0313-9