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The 6 references without a DOI — listed, not checked
no DOI — not checkedBaiyuan Gu: Study on the Forward Collision Warning System Based on Monocular Vision, Jilin University, (2006). (in Chinese).
no DOI — not checkedZhiqiang Liu, Wen Hua, in: Computer Applications, Vol. 27(8), (2007), p.2056-(2058).
no DOI — not checkedYang Han: The Research of Automobile's Rear-end Collision Warning System on Expressway, North University of China, (2008). (in Chinese).
no DOI — not checkedZhisheng Yu: Automobile Theory. (2007). (in Chinese).
no DOI — not checkedGenya A, John R, in: Applied Ergonomics, Vol. 37, (2006), pp.577-586.
no DOI — not checkedDeHai Chen: Study on estimating the state of driving safety in true environment and Rear-end Collision Warning System, JiangXi University of Science and Technology, (2006). (in Chinese).
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