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Fejer et al. (2009). Fejer, Szilard N.; James, Tim R. James; Hernández-Rojasc, Javier; Wales, David J. (2009). "Energy landscapes for shells assembled from pentagonal and hexagonal pyramids". Physical Chemistry Chemical Physics. 11 (12): 2098–2104. Bibcode:2009PCCP...11.2098F. doi:10.1039/B818062H. PMID19280020.