A parameterized generalization of the sum formula for quadruple zeta   values
  We give a parameterized generalization of the sum formula for quadruple zeta values. The generalization has four parameters, and is invariant under a cyclic group of order four. By substituting special values for the parameters, we also obtain weighted sum formulas for quadruple zeta values, which contain some known results. 
Tomoya Machide
math.NT