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2. Die graphische statik;Culmann,1864
3. On reciprocal figures, frames and diagrams of forces;Maxwell;Phil Mag,1864
4. Graphical statics: two treatises on the graphical calculus and reciprocal figures in graphical statics;Cremona,1890
5. Geometry-based understanding of structures;Van Mele;J Int Assoc Shell Spat Struct,2012