波罗的海惊魂：神秘失踪与危险航行数学荒岛历险记2

　　For a long time a peaceful trade area, the Baltic Sea became a major geopolitical hotspot in recent times. The inland sea forms the natural border between 8 states of the EU and Russia. Many strategic questions and issues arise from this constellation that have to do with gas pipelines, territorial claims and foreign policy influences. It is now clear that the time when the Eur... (展开全部)