21
by Johnson, D. L.
Published 1998
Springer London

22
by Schröder, Bernd S. W.
Published 2003
Birkhäuser Boston

23
by Devlin, Keith
Published 1993
Springer New York

24
by Zemanian, Armen H.
Published 2001
Birkhäuser Boston

25
by Khoussainov, Bakhadyr, Nerode, Anil
Published 2001
Birkhäuser Boston

26
by Megiddo, Nimrod
Published 1994
Springer New York

27
by Moschovakis, Yiannis N.
Published 1992
Springer New York

28
by Adelson-Velsky, G. M., Arlazarov, V. L., Donskoy, M. V.
Published 1988
Springer New York

29
by Fejer, Peter A., Simovici, Dan A.
Published 1991
Springer New York

30
by Bruyn, L., Bergh, M., Oystaeyen, F.
Published 1988
Birkhäuser Boston

31
by Jeffries, Clark
Published 1991
Birkhäuser Boston

32
by Ewald, Günter
Published 1996
Springer New York

33
by Fenton, William E., Dubinsky, Ed
Published 1996
Springer New York

34
by Morris, Peter
Published 1994
Springer New York

35
by Gaier, Dieter
Published 1987
Birkhäuser Boston

36
by Stanton, Dennis, White, Dennis
Published 1986
Springer New York

37
by Godsil, Chris, Royle, Gordon
Published 2001
Springer New York

38
Published 2002
Springer US

39
Published 2003
Springer US

40
by Petkov, Petio Petrov
Published 1990
Springer US