Kambiz Ghazinour Sampson Pun Maryam Majedi Amir H. Chinaei Ken Barker Extending SQL to Support Privacy Policies. 377-393 2010 From Sociology to Computing in Social Networks http://dx.doi.org/10.1007/978-3-7091-0294-7_20 series/lnsn/2010-1 db/series/lnsn/lnsn1.html#GhazinourPMCB10