Janet Novack (10 de septiembre de 2014). «The Tax Inversion Rush: One Handy Graphic». Forbes Magazine. «The U.S. company is in black, as is the share of the merged company its current shareholders will own; it must be less than 80% for the tax trick to work under the current law.»
Authur Beesley (20 de diciembre de 2018). «Drugs group Perrigo hit with €1.64bn Irish back tax bill». Financial Times. «The tax assessment is Ireland’s largest since the European Commission directed Apple to pay €14.3bn in disputed back taxes to Dublin in a record-breaking ruling that the Irish authorities have taken to the European courts for an appeal.»
«UPDATE 4-U.S. drugmaker Perrigo to buy Ireland's Elan for $8.6 bln». Reuters. 29 de julio de 2013. «DUBLIN, July 29, 2013 (Reuters) - U.S. drugmaker Perrigo agreed to buy Elan for $8.6 billion in a deal that will hand it tax savings from being domiciled in Ireland and royalties from a blockbuster multiple sclerosis treatment.»
