Elena Vasilyeva Maik Thiele Christof Bornhövd Wolfgang Lehner Top-k Differential Queries in Graph Databases. 112-125 2014 ADBIS https://doi.org/10.1007/978-3-319-10933-6_9 conf/adbis/2014 db/conf/adbis/adbis2014.html#VasilyevaTBL14