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\bibitem{vandenHeuvel_etal2010} {\textquotedblleft}\textit{Ultralow blocking temperature and breakdown of the giant spin model in Er$^{3+}$-doped nanoparticles}{\textquotedblright}. van den Heuvel W, Tikhomirov VK, Kirilenko D, Schildermans N, Chibotaru LF, Vanacken J, Gredin P, Mortier M, Van Tendeloo G, Moshchalkov VV, Physical review : B : condensed matter and materials physics \textbf{82}, 094421 (2010).   http://doi.org/10.1103/PhysRevB.82.094421

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