Updates are available Erratum dated 2020-08-13
Click to view Erratum: https://doi.org/10.1140/epjc/s10052-020-8264-4
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Article History
Received: 26 April 2018
Accepted: 31 May 2018
First Online: 9 June 2018
Change Date: 13 August 2020
Change Type: Erratum
Change Details: A missing factor of <i>i</i> in Eq. (C1) has led to an incorrect expression for the last line of Eq. 14. The correct expression should read
