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by Inge Frick in Stockholm in the late 1970s to early 1980s.
. The current version runs on Sun
-3 and is
["Sheep, a Computer Algebra System for General Relativity",
J.E.F. Skea et al in Proc First Brazilian School on Comp Alg,
W. Roque et al eds, Oxford U Press 1993, v2].