Finster, Felix
Strohmaier, Alexander
Article History
Received: 21 March 2014
Accepted: 7 July 2014
First Online: 27 February 2015
Change Date: 28 December 2017
Change Type: Correction
Change Details: In Section 5.1 in [1] it is incorrectly claimed that condition (A) is equivalent to the vanishing of the operator B in the expansion.