Before revision: Following the seminal works of Danzer (1956, 1986) and Stach\'{o} ( 1965, 1981) , and the recent result of Har-Peled et. al. (2018), we study the problem of stabbing disks by points.
After revision: In their seminal work, Danzer (1956, 1986) and Stach\'{o} ( 1965, 1981) , and the recent result of Har-Peled et. al. (2018), we study the problem of stabbing disks by points.