  This note adds three annexes to my previous paper math/9904044
  Annex 1. A sufficient condition for self-adjointness
  Annex 2. Invariant closed operators on locally compact abelian groups
  Annex 3. The trace of Connes for quaternions
  This last item is a minor variation on the evaluation of Connes's trace
(math/9811068), which is explained here in the setting of quaternions and can
be applied also to any abelian local field.
