Implementing open innovation in catching-up economies : evidence from Estonia's ICT sectorKalvet, Tarmo; Tiits, MarekProceedings of the 5th ISPIM Innovation Symposium, Seoul, Korea - 9-12 December 20122012 / [13] p. : ill https://www.researchgate.net/publication/235347822_Implementing_Open_Innovation_in_Catching-up_Economies_Evidence_from_Estonia's_ICT_Sector