Book review: Governing Difference: Internal and External Differentiation in European Union Law, by Christoph M. Sielmann. (Baden-Baden: Nomos, 2020) - Common Market Law Review View Book review: Governing Difference: Internal and External Differentiation in European Union Law, by Christoph M. Sielmann. (Baden-Baden: Nomos, 2020) by - Common Market Law Review Book review: Governing Difference: Internal and External Differentiation in European Union Law, by Christoph M. Sielmann. (Baden-Baden: Nomos, 2020) 59 5

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