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The current subscription began on 29/04/2019 and is issued twice per year
The first subscription was started on 29/04/2019
Location: Reference
Vol.11, No 1 & 2 (June & December 2011); Vol.12, No 1 & 2 (June & December 2012); Vol.13, No 1 & 2 (June & December 2013); Vol.14, No 1 & 2 (June & December 2014); Vol.15, No 1 & 2 (June & December 2015); Vol.16, No 1 & 2 (June & December 2016) ; Vol.16, No 1 (June 2016) ; Vol.16, No 2 (December 2016) ; Vol.16, No 1 (June 2016)