Hans Dieter Baehr ... [et al.] Hans Dieter Baehr. Hans-Dieter Burkhard ... [et al.] (eds.). Francoise Heritier ... et al. Hans Dieter Baehr und Klaus Schwier. Dieter Hutter ... [et al.] Jan R. Williams ... et al. Didier Bert et al. Hans Agerschou ... [et al.]. Hans Keune ... [et al.].