Trotha, Hans Von (1) De Jongste, Hans (1) Lehmann, Hans-thies (johann Wolfgang Goethe-universitat, Germany) (1) Senge, Peter, Scharmer, C. Otto, Jaworski, Joseph, Flowers, Betty Sue (1) Tokmakidou, Stella, Efthimiadou, Noula, Vosswinkel, Annette, Georgiakaki, Manuela (1)