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Bueno-de-la-Fuente, G.; Hernández-Pérez, T.; Rodríguez-Mateos, D.; Méndez-Rodríguez, E.M.; Martín-Galán, B.: Study on the use of metadata for digital learning objects in University Institutional Repositories (MODERI) (2009)
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Thomas, C.; McDonald, R.H.; McDowell, C.S.: Overview - Repositories by the numbers (2007)
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Pinfield, S.; Salter, J.; Bath, P.A.; Hubbard, B.; Millington, P.; Anders, J.H.S.; Hussain, A.: Open-access repositories worldwide, 2005-2012 : past growth, current characteristics, and future possibilities (2014)
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Semantic digital libraries (2009)
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