Noga Alon Haim Kaplan Gabriel Nivasch Micha Sharir Shakhar Smorodinsky Weak ε-nets and interval chains. 1194-1203 2008 SODA http://doi.acm.org/10.1145/1347082.1347212 conf/soda/2008 db/conf/soda/soda2008.html#AlonKNSS08