This appears to have been discussed extensively on several history  
lists following an initial discussion on H-Africa. THere is an  
article on it all in the January 12, 1996 issue of the Chronicle of  
Higher Education, page A18.  
 
The article says that the material on citations can be found on the  
net by gopher to: 
 
gopher://h-net.edu70/00/lists/H-AFRICA/internet-cit 
 
 
E. Roy Weintraub, Professor of Economics 
Duke University, Box 90097 
Durham, North Carolina 27708-0097 
 
Phone and voicemail: (919) 660-1838  
Fax: (919) 684-8974 
E-mail: [log in to unmask] 
Web Site: http://www.econ.duke.edu/~erw/erw.homepage.html