1. [I] K.E. Tsiolkovski, Grezi o zemle i nebe (i) Na Vesta (Speculations between Earth and sky, and on Vesta; science fiction works), pp.35, izd-voAN SSSR, Moscow (1959).
2. A.K. Misra and V.J. Modi, A Survey on the Dynamics and Control of Tethered Satellite Systems, NASA/AIAA/PSN International Conference on Tethers, 17-19September 1986, Arlington, VA, Paper No. AAS-86-246; also Advances in the Astronautical Sciences, Editors: P.M. Bainum et al., American Astronautical Society, Vol. 62, pp.667-719.