1
2
3
4
5
6
Published 1972
Other Authors:
“...Van Emden, Helmut Fritz....”
Book
7
8
9
Published 2007
Other Authors:
“...Van Emden, Helmut Fritz....”Table of contents only
Publisher description
Book
10
Published 2012
Other Authors:
“...Van Emden, Helmut Fritz....”
Book
11
Published 1978
Other Authors:
“...Van Emden, Helmut Fritz....”
Conference Proceeding
Book