J. Wildhaber (Fribourg, Switzerland)
A. Jung (Davos, Switzerland), C. Bütikofer (Zürich, Switzerland)
A. Jung (Davos, Switzerland), C. Bütikofer (Zürich, Switzerland)
A. Jung (Davos, Switzerland), C. Bütikofer (Zürich, Switzerland)
A. Jung (Davos, Switzerland), C. Bütikofer (Zürich, Switzerland)