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2. Decreasing the nesting depth of expressions involving square roots;Borodin;J. Symb. Comput.,1985
3. The Thirteen Books of Euclid's Elements, vol. III,1956
4. On simplifying nested radicals and solving polynomials by pure nested radicals of minimum depth;Horng,1990
5. Endliche Gruppen I;Huppert,1979