Andrew Hume Scott Daniels Angus MacLellan Gecko: Tracking a Very Large Billing System. 93-106 2000 conf/usenix/2000g USENIX Annual Technical Conference, General Track http://www.usenix.org/publications/library/proceedings/usenix2000/general/hume.html db/conf/usenix/usenix2000g.html#HumeDM00