1
by Halder, Winfrid
Published 2001
Schöningh

2
by Wessner, Charles W.
Published 2008
National Academies Press

3
by Wessner, Charles W.
Published 2009
National Academies Press

4
by Puhle, Hans-Jürgen
Published 1975
Vandenhoeck & Ruprecht

6
Published 2015
The National Academies Press

7
by Alper, Joe
Published 2014
The National Academies Press