Tomasz Pieciukiewicz Krzysztof Stencel Kazimierz Subieta Usable Recursive Queries. 17-28 2005 conf/adbis/2005 ADBIS http://dx.doi.org/10.1007/11547686_2 db/conf/adbis/adbis2005.html#PieciukiewiczSS05