Qinglan Xia (2008년). “The geodesic problem in nearmetric spaces”. 《Journal of Geometric Analysis》 19 (2): 452–479. arXiv:0807.3377. Bibcode:2008arXiv0807.3377X.
Qinglan Xia (2008년). “The geodesic problem in nearmetric spaces”. 《Journal of Geometric Analysis》 19 (2): 452–479. arXiv:0807.3377. Bibcode:2008arXiv0807.3377X.