IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING, vol. 23, no. 11, page. 1753 - 1758, 2011-11
GEOINFORMATICA, vol. 15, no. 4, page. 665 - 697, 2011-10
Proceeding of VLDB Endowment (PVLDB), page. 1295 - 1306, 2011-08
SIGMOD RECORD, vol. 40, no. 1, page. 32 - 34, 2011-03