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From 2005 up to 2020, four issues of the journals were being published in a year (March, June, September and December)

However, starting 2021 there will be 6 issues will be published each year

(February, April, June, August, October and December)

And starting 2023, issue will be published monthly (12 issues per year).

Open Access issues (2005 - 2012) can be viewed here:

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