1
by Figgie, Harry E.
Published 1993
2
Published 1993
3
by Dolbeare, Kenneth M.
Published 1996
4
Published 2010
5
Published 2003
6
Published 1997
7
by Simai, Mihaly
Published 1995
8
Published 2003
9
Published 1991
10
Published 2015
11
Published 2015
12
Published 2015
13