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\bibitem{Gou_etal2013} {\textquotedblleft}\textit{Discovery of a superhard iron tetraboride superconductor}{\textquotedblright}.  Gou H, Dubrovinskaia N, Bykova E, Tsirlin AA, Kasinathan D, Schnelle W, Richter A, Merlini M, Hanfland M, Abakumov AM, Batuk D, Van Tendeloo G, Nakajima Y, Kolmogorov AN, Dubrovinsky L;, Physical review letters \textbf{111}, 157002 (2013).   http://doi.org/10.1103/PhysRevLett.111.157002

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