Brandt, E. H. Emeriti and Others, Max Planck Institute for Intelligent Systems, Max Planck Society;
Morawetz, K., Lipavsky, P., Kolacek, J., Brandt, E. H., & Schreiber, M. (2007). The concept of correlated density and its application. International Journal of Modern Physics B, 21(13&14), 2348-2361.