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Anchor, J.R (2000) Other mining. Industry and the British Economy. pp. 62-65.
Pati, Prasanta and Mather, Peter (2011) Open Area Concealed Weapon Detection System. Proceedings of SPIE 8017, 801702 (2011), Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVI, 8017 (01). pp. 801702-801709. ISSN 9780819485915
Pradhan, Suman and Mishra, Rakesh (2012) Experimental verification of the four-sensor probe model for flow diagnosis in air water flow in vertical pipe. Journal of Physics: Conference Series, 364. 012073. ISSN 1742-6596