1. The SMT-LIB standard – version 2.0;Barrett,2010
2. Graphical conjunctive queries;Bonchi,2018
3. Optimal implementation of conjunctive queries in relational data bases;Chandra,1977
4. Specifying graph languages with type graphs;Corradini,2017
5. Graph processes;Corradini;Fundam. Inform.,1996