My interest in the EC law on free movement of goods is long-standing and more than casual, but much less than scholarly. So I am delighted to contribute some remarks without pretending to expertise.
Regan, Donald H. "An Outsider's View of Dassonville and Cassis de Dijon: On Interpretation and Policy." In The Past and Future of EU Law: The Classics of EU Law Revisited on the 50th Anniversary of the Rome Treaty, edited by M. P. Maduro and L. Azoulai, 465-73. Oxford: Hart Publishing, 2010.