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4. G. Baumslag, D. Gildenhuys and R. Strebel, Algorithmically insoluble problems about finitely presented soluble groups, Lie and associative algebras II, J. Algebra, to appear.
5. G. Baumslag, D. Gildenhuys and R. Strebel, Algorithmically insoluble problems about finitely presented soluble groups, Lie and associative algebras III, in preparation.