Zeta functions interpolating the convolution of the Bernoulli   polynomials
  We prove nonlinear relation on multiple Hurwitz-Riemann zeta functions. Using analytic continuation of these multiple Hurwitz-Riemann zeta function, we quote at negative integers Euler's nonlinear relation for generalized Bernoulli polynomials and numbers. 
Abdelmejid Bayad, Takao Komatsu
math.NT