Note on divisible difference sets from Galois rings GR(9,n)
  In this note, we give a new construction of divisible difference sets in ${\Bbb Z}_{9}^n$ using Galois ring $GR(3^2,n)$ under the assumption of the existence of skew Hadamard difference sets in ${\Bbb F}_{3^n}$. 
Koji Momihara
math.CO