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\bibitem{Garud_etal2018} {\textquotedblleft}\textit{Surface passivation of CIGS solar cells using gallium oxide}{\textquotedblright}. Garud S, Gampa N, Allen TG, Kotipalli R, Flandre D, Batuk M, Hadermann J, Meuris M, Poortmans J, Smets A, Vermang B, Physica status solidi : A : applications and materials science \textbf{215}, 1700826 (2018).   http://doi.org/10.1002/PSSA.201700826

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