In this paper we prove new sum formulas for Mordell–Tornheim zeta values in the case of depth 2 and 3, expressing the sums as single multiples of Riemann zeta values. Also, we obtain weighted sum formulas for double Mordell–Tornheim zeta values. Moreover, we present a sum formula for the Mordell–Tornheim series of even arguments.
"On sum formulas for Mordell–Tornheim zeta values." Rocky Mountain J. Math. 50 (1) 225 - 235, Febuary 2020. https://doi.org/10.1216/rmj.2020.50.225