14
Published 1995
Book
15
by Willrich, Michael.
Published 2011
Book
16
by Robins, Joseph.
Published 1995
Book
17
by Janković, Vladimir, 1961-
Published 2010
Book
18
by Aberth, John, 1963-
Published 2011
Online version
Online Book
19
Published 1991
Book
20
by Jackson, Robert H.
Published 1994
Book