@misc {IOPORT.70089525,
    author       = {Alon, Noga and Feige, Uriel},
    title        = {On the power of two, three and four probes},
    howpublished = {SODA, 346-354 (2009).},
    year         = {2009},
    doi          = {10.1145/1496770.1496809},
    identifier   = {70089525},
}