Dynamic Partitioning of Big Hierarchical Graphs. - Vasilis Spyropoulos; Yannis Kotidis (BD3@VLDB, 2013)

Building Space-Efficient Inverted Indexes on Low-Cardinality Dimensions. - Vasilis Spyropoulos; Yannis Kotidis (DEXA (1), 2015)

Digree: A middleware for a graph databases polystore. - Vasilis Spyropoulos; Christina Vasilakopoulou; Yannis Kotidis (IEEE BigData, 2016)

Digree: Building A Distributed Graph Processing Engine out of Single-node Graph Database Installations. - Vasilis Spyropoulos; Yannis Kotidis (SIGMOD Rec., 2017)