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IEEE Sensors Journal > 2008 > 8 > 8 > 1422 - 1429
Electronics Letters > 1993 > 29 > 21 > 1896 - 1897
Electronics Letters > 1993 > 29 > 24 > 2151 - 2152
Electronics Letters > 1993 > 29 > 17 > 1566 - 1568
Conference Record of the Twentieth IEEE Photovoltaic Specialists Conference > 1988 > 1230 - 1235 vol.2