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Lett. 79, 2554 (1997)","work_id":"d29b25f7-4b99-4ff0-911f-a49bab411a82","year":1997},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":3,"title":"A. P. Ramirez et al. Zero-point entropy in ‘spin ice’. Nature 399, 333–335 (1999)","work_id":"1e3d5ae0-d172-4752-8036-f178820162eb","year":1999},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":4,"title":"S. T. Bramwell, M. J. P. Gingras, Spin Ice State in Frustrated Magnetic Pyrochlore Materials. Science 294, 1495–1501 (2001)","work_id":"64886b17-23a8-4dfa-81b2-f005819d3afe","year":2001},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":5,"title":"C. Castelnovo, R. Moessner, S. L. Sondhi, Magnetic monopoles in spin ice. 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