Keller, Alexander G. (2009). "The Machines of Leonardo da Vinci and Franz Reuleaux: Kinematics of Machines from the Renaissance to the 20th Century (review)". Technology and Culture. 50 (2): 454–456. doi:10.1353/tech.0.0247. S2CID108767784. ResearchGate:254964717
Keller, Alexander G. (2009). "The Machines of Leonardo da Vinci and Franz Reuleaux: Kinematics of Machines from the Renaissance to the 20th Century (review)". Technology and Culture. 50 (2): 454–456. doi:10.1353/tech.0.0247. S2CID108767784. ResearchGate:254964717
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Keller, Alexander G. (2009). "The Machines of Leonardo da Vinci and Franz Reuleaux: Kinematics of Machines from the Renaissance to the 20th Century (review)". Technology and Culture. 50 (2): 454–456. doi:10.1353/tech.0.0247. S2CID108767784. ResearchGate:254964717