Pourgholamhossein, M.
Ranjbar, M. A.
Article History
Received: 8 April 2018
Accepted: 6 December 2018
First Online: 24 January 2019
Change Date: 8 May 2020
Change Type: Correction
Change Details: (i) In the first assertion of the Lemma 1 in [2], it is necessary that .