Educational links:

http://gradworks.umi.com/34/17/3417116.html

http://gradworks.umi.com/33/40/3340917.html

http://gradworks.umi.com/32/97/3297180.html

http://www.punchng.com/Articl.aspx?theartic=Art200807061382587

http://www.punchng.com/Articl.aspx?theartic=Art200805181371342