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Electronics Letters > 1992 > 28 > 19 > 1841 - 1842
Electronics Letters > 1990 > 26 > 13 > 852 - 854
Electronics Letters > 1990 > 26 > 19 > 1633 - 1635
Conference Record of the Twentieth IEEE Photovoltaic Specialists Conference > 1988 > 738 - 743 vol.1