Probably a bit off topic but I know some people here know the answer
and I am deadly afraid of StackExchange---where "url in hungarian"
returned 18 irrelevant answers..
How do I get
\url{http://en.wikipedia.org/wiki/Zolt%C3%A1n_P%C3%A1l_Dienes}
\url{http://en.wikipedia.org/wiki/ZoltC3A1n_PC3A1l_Dienes}
to work?
Hopeful regards
--schremmer