Hillel and Akiba links

Hillel
On One Foot: An In-Depth Analysis of B. Shabbat 30b–31a
 JewishEncyclopedia.com - HILLEL:


Akiba

Louis Ginzberg's ariticle on Akiba ben Joseph from JewishEnclyclopedia.comhttp://www.jewishencyclopedia.com/view.jsp?artid=1033&letter=A#0
http://www.jewishencyclopedia.com/view.jsp?artid=1033&letter=A#0

See pp. 4ff of  
Rabbis of ancient times: biographical sketches of the Talmudic period (300 BCE to 500 CE) by Dov Aryeh B. Leib Friedman, Abraham Hyman Fromenson; available online from Google Books
http://books.google.com/books?id=j1VKAAAAYAAJ&pg=PR1#v=onepage&q=&f=false