261
by Vietze, Arthur
Published 1922
Springer Berlin Heidelberg

262
by Ramsauer, Bernhard
Published 1949
Springer Berlin Heidelberg

265
by Riedner, Rudolf
Published 1927
Springer Berlin Heidelberg

268
by Wittmack, Ludwig
Published 1928
Springer Berlin Heidelberg

271
by Seiden, Rudolph, Dykstra, Richard R., Gough, W. James
Published 1961
Springer Berlin Heidelberg

273
by Görz, J.
Published 1888
Springer Berlin Heidelberg