{"references": ["Articles 6(2) and 8(2) of the EUMR (Council Regulation (EC) No 139/2004 of 20 January 2004 on the control of concentrations between undertakings, EU OJ L 24, 29.01.2004, p. 1-22. Available from: https://eur-lex.europa.eu/eli/reg/2004/139/oj).", "Commission Notice on Remedies acceptable under Council Regulation (EC) No 139/2004 and under Council Regulation (EC) No 802/2004 (2008/C 267/01), EU OJ OJ C 267, 22.10.2008, p. 1\u201327, par. 15. Available from: https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX- :52008XC1022(01).", "Speech by Vestager 'Competition in Telecom Markets' delivered at 42nd Annual Conference on International Law and Policy, Fordham University, 2 October 2015.", "Letter from Alex Chisholm, Chief Executive Competition and Markets Authority United Kingdom to Commissioner Margrethe Vestager, European Commission from 11 April 2016. Available from: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/ fle/515405/CMA_letter_to_Commissioner_Margrethe_Vestager.pdf#page24."]}

This unit was published in „International Cooperation of Competition Authorities in Europe: from Bilateral Agreements to Transgovernmental Networks” Błachucki, M., ed., (2020). The case study is devoted to the analysis of the European Commission’s decision in the Three/O2 UK merger. The case represents a shift in Commission’s analysis of telecom mergers. It is also a model example of cooperation between NCAs and the European Commission in merger cases.