References References The overview of the development and the results of the business and of the position of the whole of the companies included in the consolidation is included in the Financial Review of the 2017 Annual Report. A description of the principal risks and uncertainties is included in the Corporate Governance Statement of the 2017 Annual Report. In addition, reference is made to Notes 3 and 7.3 to the consolidated financial statements, of the Financial Review in the 2017 Annual Report. The significant events occurring after the balance sheet date are described in Note 7.6 to the consolidated financial statements of the Financial Review in the 2017 Annual Report. The research and development activities are described in the Chapter Technology & Innovation of the 2017 Annual Report. In addition, reference is made to Notes 5.1 and 5.2 to the consolidated financial statements of the Financial Review in the 2017 Annual Report. The information concerning the use of financial instruments is included in Note 7.3 to the consolidated financial statements of the Financial Review in the 2017 Annual Report. The non-financial information is included in the separate Sustainability Report issued 30 March 2018.