Subjects: “…[Schmidt, Helmut, Friderichs, Hans]…”

Subjects: “…[Schmidt, Helmut, Riad, Mahmoud]…”

Subjects: “…[Schiller, Karl, Schmidt, Helmut]…”

Subjects: “…[Schiller, Karl; Schmidt, Helmut]…”

Subjects: “…[Wischnewski, Hans-Jürgen, Schmidt, Helmut]…”

Subjects: “…[Schiller, Karl, Schmidt, Helmut, Hermsdorf, Hans]…”

Subjects: “…[Schiller, Karl; Schmidt, Helmut; Hermsdorf, Hans]…”