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Draim tetrahedral constellation modelled in SaViDraim tetrahedral constellation coverage modelled in SaVi
Draim tetrahedral satellite constellation modelled in SaVi

John E. Draim et al., Common-period four-satellite continuous global coverage constellations revisited,
Advances in the Astronautical Sciences, vol. 143, pp. 667-686, January 2012.

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