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2. Internal forces in a uniformly loaded helicoidal girders;Scordelis;J. ACI,1960
3. Generalized stiffness matrix of a curved-beam element;Lee;AIAA Jl,1969
4. Static analysis of helicoidal bars;Alghamdi,1989
5. A Theorem on the decoupling of higher order linear differential systems with variable coefficients;Theocaris;Industrial Math.,1983