National varieties of public-private partnerships (PPPs) : a comparative analysis of PPP-supporting units in 19 European countriesvan den Hurk, Martijn; Brogaard, Lena; Lember, Veiko; Petersen, Ole Helby; Witz, PetrJournal of comparative policy analysis : research and practice2016 / p. 1-20 : tab https://doi.org/10.1080/13876988.2015.1006814 Journal metrics at Scopus Article at Scopus Article at WOS Article at WOS