Eder John Scheid, Manuel Keller, Muriel Franco, Burkhard Stiller: BUNKER: a Blockchain-based trUsted VNF pacKagE Repository; 16th Conference on the Economics of Grids, Clouds, Systems, and Services (GECON 2019), Leeds, UK, September 2019, pp 1-9. URL: http://www.gecon.info/articlesgecon2019/no16_paper29.pdf.