Dajczer, M.
Vlachos, Th.
Article History
Received: 17 October 2016
Accepted: 15 February 2017
First Online: 24 February 2017
Change Date: 13 October 2017
Change Type: Correction
Change Details: All the results of the paper remain true as stated but there is a serious gap in the proof of Theorem 13. Equations (26) and (27) need to be corrected.