Grädel, E., & Kreutzer, S. (1999). Descriptive Complexity Theory for Constraint Databases. Springer.
Chicago-čujuhus (17. p.)Grädel, E., juo S. Kreutzer. Descriptive Complexity Theory for Constraint Databases. Springer, 1999.
MLA-čujuhus (9. p.)Grädel, E., juo S. Kreutzer. Descriptive Complexity Theory for Constraint Databases. Springer, 1999.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.