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Leis, John and Buttsworth, David and Snook, Chris and Holmes, Graham (2014) Detection of potentially explosive methane levels using a solid-state infrared source. IEEE Transactions on Instrumentation and Measurement, 63 (12). pp. 3088-3095. ISSN 0018-9456
University of Southern Queensland (2005) Method and apparatus for measuring electrical conductivity. 2005205611.