<em>Sonderegger, Christof: DDR, Ostberlin, 09/1976 (Com_L24-0485-0001-0009, <a href="http://doi.org/10.3932/ethz-a-001026116">http://doi.org/10.3932/ethz-a-001026116</a>)
<em>Sonderegger, Christof: DDR, Ostberlin, 09/1976 (Com_L24-0485-0001-0009, <a href="http://doi.org/10.3932/ethz-a-001026116">http://doi.org/10.3932/ethz-a-001026116</a>)
