The Jacquet-Langlands correspondence, Eisenstein congruences, and   integral L-values in weight 2
  We use the Jacquet-Langlands correspondence to generalize well-known congruence results of Mazur on Fourier coefficients and L-values of elliptic modular forms for prime level in weight 2 both to nonsquare level and to Hilbert modular forms. 
Kimball Martin
math.NT