Davenport's constant for groups of the form $Z_3 \oplus Z_3 \oplus   Z_{3d}$
  We determine Davenport's constant for all groups of the form $\Z\_3\oplus \Z\_3\oplus\Z\_{3d}$. 
Gautami Bhowmik (LPP), Jan-Christoph Schlage-Puchta