@unpublished{publication-14600, author={Hsieh, Chih-Sheng and K{\"o}nig, Michael D and Liu, Xiaodong}, institution={University of Zurich}, issn={1664-7041}, number=217, pages=44, series={Working paper series / Department of Economics}, title={Network formation with local complements and global substitutes: the case of R&D networks}, year=2017, }