http://en.wikipedia.org/wiki/Bernhard_Riemann
http://www.answers.com/topic/bernhard-riemann
http://www.mathematicianspictures.com/Mathematicians/Riemann.htm
http://www.emis.de/classics/Riemann/
_ Stereographic projection of Riemann sphere
http://www.youtube.com/watch?v=6JgGKViQzbc
_ Riemann zeta function
http://www.youtube.com/watch?v=zfoVTY9OnA4