@article{itic06,
   author = {P. Boinski and K. Jozwiak and M. Wojciechowski and M. Zakrzewicz},
   title = {Estimating Hash-Tree Sizes in Concurrent Processing of Frequent Itemset Queries},
   journal = {International Journal of Information Technology and Intelligent Computing},
   publisher = {Academy of Humanities and Economics},
   issn = "1895-8648"
   year = 2006,
   volume = 1,
   number = 2,
   pages = "405--417",
}