1. G. Colombo, E. M. Gaposchkin, M. D. Grossi andG. C. Weiffenbach:Shuttleborne «Sky-hook»: a new tool for low orbital altitude research. Report Geoastronomy No. 1, Smithsonian Astrophysical Observatory (1974).
2. P. M. Kalaghan, D. A. Arnold, G. Colombo, M. D. Grossi, L. R. Kirschner andO. Orringer:Study of the dynamics of a tethered satellite system (Sky-Hook), Final Report NAS8-32199, Smithsonian Astrophysical Observatory (March 1978).
3. P. R. Williamson andP. M. Banks:The tethered balloon current generator, Final Report NASA USDC-NOAA 03-5-022-60 (January 1976).
4. M. Dobrowolny:Radio Sci. 13, 478 (1978).
5. M. Dobrowolny:Wave and particle phenomena induced by an electrodinamic tether, Smithsonian Observatory, Special Report 388 (November 1979).