Cohomology mod 3 of the classifying space of the exceptional Lie group   $E_6$, I : structure of Cotor
  We study the structure of the $E_2$-term of the Rothenberg-Steenrod spectral sequence converging to the mod 3 cohomology of the classifying space of the compact, connected, simply connected, exceptional Lie group of rank 6. 
Mamoru Mimura, Yuriko Sambe and Michishige Tezuka
math.AT