Eisenstein Cohomology and ratios of critical values of Rankin-Selberg   L-functions
  This is an announcement of results on rank-one Eisenstein cohomology of GL(N), with N > 1 an odd integer, and algebraicity theorems for ratios of successive critical values of certain Rankin-Selberg L-functions for GL(n) x GL(n') when n is even and n' is odd. 
Guenter Harder and A. Raghuram
math.NT math.AG math.RT