Kiepert, Ludwig (1846 - 1934) Stegemann, Max.
Serret, Joseph Alfred (1819 - 1885) Harnack, Axel (1851-1888) Bohlmann, Georg (1869-1928)
Kiepert, Ludwig (1846 - 1934) Stegemann, Max.
Nernst, Walther Hermann (1864 - 1941) Schoenflies, Arthur (1853 - 1928)