Jesper Andersen Anders Giversen Allan H. Jensen Rune S. Larsen Torben Bach Pedersen Janne Skyt Analyzing Clickstreams Using Subsessions. 2000 DOLAP db/conf/dolap/dolap2000.html#AndersenGJLPS00 25-32 http://doi.acm.org/10.1145/355068.355312