Zong, Chuanming (2008). "The kissing number, blocking number and covering number of a convex body". In Goodman, Jacob E.; Pach, J├ínos; Pollack, Richard (eds.). Surveys on Discrete and Computational Geometry: Twenty Years Later (AMS-IMS-SIAM Joint Summer Research Conference, June 18ÔÇô22, 2006, Snowbird, Utah). Contemporary Mathematics. Vol. 453. Providence, RI: American Mathematical Society. pp. 529–548. doi:10.1090/conm/453/08812. ISBN9780821842393. MR2405694..
See also Lemma 3.1 in Marathe, M. V.; Breu, H.; Hunt, H. B.; Ravi, S. S.; Rosenkrantz, D. J. (1995). "Simple heuristics for unit disk graphs". Networks. 25 (2): 59. arXiv:math/9409226. doi:10.1002/net.3230250205.
See also Lemma 3.1 in Marathe, M. V.; Breu, H.; Hunt, H. B.; Ravi, S. S.; Rosenkrantz, D. J. (1995). "Simple heuristics for unit disk graphs". Networks. 25 (2): 59. arXiv:math/9409226. doi:10.1002/net.3230250205.
Zong, Chuanming (2008). "The kissing number, blocking number and covering number of a convex body". In Goodman, Jacob E.; Pach, J├ínos; Pollack, Richard (eds.). Surveys on Discrete and Computational Geometry: Twenty Years Later (AMS-IMS-SIAM Joint Summer Research Conference, June 18ÔÇô22, 2006, Snowbird, Utah). Contemporary Mathematics. Vol. 453. Providence, RI: American Mathematical Society. pp. 529–548. doi:10.1090/conm/453/08812. ISBN9780821842393. MR2405694..