Review article
Choices and Limitations
Diemert, A; Diehl, W; Glosemeyer, P; Deprest, J; Hecher, K
A Systematic Analysis
Kaufmann, J; Laschat, M; Wappler, F
Approaches and Consequences
Stein, R; Hohenfellner, M; Pahernik, S; Roth, S; Thüroff, J W; Rübben, H
