1
Serial
2
3
by Rachfahl, Felix
Published 1895
Book
4
by Frommhold, Georg
Published 1895
Book
8
by Friese, Victor
Published 1905
Book
9
Article
10
Article
11
by Klewitz, Hans-Walter
Published 1966
Book
13
by Stengel, Edmund E.
Published 1938
Book
14
Article
15