His efforts to promote international collaboration led him to organise several large projects in the EU and DFG and to become the speaker of an International Research Training Group on complex networks (DFG and Brazil) since 2011.
Jeho úsilie podporovať medzinárodnú spoluprácu viedlo k organizácii niekoľkých veľkých projektov EU a DFG, je predstaviteľom International Research Training Group on complex networks (DFG-Nemecko a Brazília).