%0 Journal Article %T History of the Tether Concept and Tether Missions: A Review %A Yi Chen %A Rui Huang %A Xianlin Ren %A Liping He %J ISRN Astronomy and Astrophysics %D 2013 %I Hindawi Publishing Corporation %R 10.1155/2013/502973 %U http://dx.doi.org/10.1155/2013/502973