@article{escidoc:0778, title = {{Ab-initio statistical mechanics for ordered compounds: single-defect theory vs. cluster-expansion techniques}}, author = {Drautz, R. and Schultz, I. and Lechermann, F. and F\"ahnle, M.}, journal = {{Physica Status Solidi B}}, volume = {240}, number = {1}, pages = {37--44}, year = {2003}, doi = {} }