L. Kristjansson
P. Thoft-Christensen
Daniel S. Wilks
Roberto Sabadini
Open University.
Ralph Emery
Behzad Ghanbarian
Guochang Xu
Zhiping Lu
Richard E. Chapman
Marshall, John
Vadim Surkov
Henry Lutz Ehrlich
Harsh K. Gupta
H. Falke
P. E. Schenk
A.R. Ritsema
G. Buntebarth
P. Melchior
H. Volland