- ((:a :href "http://solo.colorado.edu/~walawend/TwilightLandscapes/DoF_article.shtml")
- "http://solo.colorado.edu/~walawend/TwilightLandscapes/DoF_article.shtml"))
+ ((:a :href "http://www.normankoren.com/Tutorials/MTF.html")
+ "http://www.normankoren.com/Tutorials/MTF.html"))