 Concerning stability accounts, Marc Lange develops his version in book-length (see his 2000 and 2009a, although the focus of the latter is not on cp-laws). Lange (2002) is a very accessible paper on his view of cp-laws. Invariance accounts are best introduced in two joint papers by James Woodward and Christopher Hitchcock (see their EG1, EG2) and in Woodward’s book Making Things Happen (2003: chapter 6). Hall (2007) provides an insightful discussion of Woodward &amp; Hitchcock’s invariance account. 