I am not yet sure how adoption coalitions differ from advocacy coalitions (later in the the process? Perhaps fits nicely in the Howlett et al Process Stream?)
see also Implementation coalitions
Zahariadis, Nikolaos, and Theofanis Exadaktylos. 2016. Policies that Succeed and Programs that Fail: Ambiguity, Conflict, and Crisis in Greek Higher Education. Policy Studies Journal 44 (1): 59–82.
marchudson.net 