Its Implications in Understanding the Central-East and Southeast European Ethnogenesis: Slavic, Baltic and Thracian (页面存档备份,存于互联网档案馆). Romanoslavica 38:
(500 km) route between Helsinki and Stockholm, which would tunnel under the Baltic Sea to connect the two capitals in under 30 minutes. Hyperloop One undertook
of the former Soviet Union at the turn of the twenty-first century: the Baltic and European states in transition (page 536) (页面存档备份,存于互联网档案馆) by Ian Jeffries