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\bibitem{Kaltsas_etal1996} {\textquotedblleft}\textit{High crystalline quality erbium silicide films on (100) silicon grown in high vacuum}{\textquotedblright}. Kaltsas G, Travlos A, Nassiopoulos AG, Frangis N, van Landuyt J, Applied surface science \textbf{102}, 151 (1996).   http://doi.org/10.1016/0169-4332(96)00036-0

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