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References
- ↑ Hopf, Heinz (1926), "Zum Clifford-Kleinschen Raumproblem", Mathematische Annalen , 95 (1): 313–339, doi:10.1007/BF01206614
- ↑ Hambleton, Ian (2015), "Topological spherical space forms", Handbook of Group Actions, Clay Math. Proc., vol. 3, Beijing-Boston: ALM, pp. 151–172
- ↑ Hass, Joel (2005), "Minimal surfaces and the topology of three-manifolds", Global theory of minimal surfaces, Clay Math. Proc., vol. 2, Providence, R.I.: Amer. Math. Soc., pp. 705–724, MR 2167285
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