Atangana, Abdon
Article History
Received: 5 September 2016
Accepted: 30 September 2016
First Online: 24 October 2016
Change Date: 18 January 2021
Change Type: Erratum
Change Details: This article has been retracted. Please see the Retraction Notice for more detail: https://doi.org/10.1140/epjp/s13360-020-00965-w