Around Merck & Co. Inc., Merck Sharp & Dohme Ltd and Merck Sharp & Dohme International Services BV v Primecrown Ltd, Ketan Himatlal Mehta, Bharat Himatlal Mehta and Necessity Supplies Ltd and Beecham Group plc v Europharm of Worthing Ltd (C-267/95, C-268/95)
21 laws and 20 links: citations, amendments, and UK copies of EU law. Bigger circles are relied on more.