An explicit bound for the first sign change of the Fourier coefficients
  We give an explicit upper bound for the first sign change of the Fourier coefficients of an arbitrary non-zero Siegel cusp form $F$ of even integral weight on the Siegel modular group of arbitrary genus $ g\geq 2 $. 
YoungJu Choie, Sanoli Gun and Winfried Kohnen
math.NT