Haxeltine, A, Pel, B, Dumitru, A, Avelino, F, Kemp, R, Bauler, T, Kunze, I, Dorland, J, Wittmayer, J & Jørgensen, M S 2017 ' Towards a TSI theory : a relational framework and 12 propositions ' Trans Tech Publications Ltd. Haxeltine, A, Pel, B, Dumitru, A, Avelino, F, Kemp, R, Bauler, T, Kunze, I, Dorland, J, Wittmayer, J & Jørgensen, M S 2017 ' Towards a TSI theory : a relational framework and 12 propositions ' Trans Tech Publications Ltd. < http://www.transitsocialinnovation.eu/content/original/Book%20covers/Local%20PDFs/286a%20TRANSIT_WorkingPaper_TowardsTSItheory%20AH161217.pdf >