References
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- K. S. Park, On the differentiability of a distance function, Publ. Inst. Math. (Beograd) (N.S.) 83(97) (2008), 65–69. https://doi.org/10.2298/PIM0897065P
- G. Tian, Canonical Metrics in Kahler Geometry, Birkhauser Verlag, 2000.