This issue has been available online since 31st October 2022 for the regular issue of Vol 8 No 2 (2022). All articles in this issue (10 original research articles) were authored/co-authored by 32 authors from 3 countries (Indonesia, Netherland and United States).

This issue has been available online since 30th April 2022 for the regular issue of Vol 8 No 1 (2022). All articles in this issue (10 original research articles) were authored/co-authored by 29 authors from 1 country (Indonesia) with diverse affiliations.

This issue has been available online since 31st October 2021 for the regular issue of Vol 7 No 2 (2021). All articles in this issue (10 original research articles) were authored/co-authored by 30 authors from 1 country (Indonesia) with diverse affiliations.

This issue has been available online since 30th April 2021 for the regular issue of Vol 7 No 1 (2021). All articles in this issue (10 original research articles) were authored/co-authored by 27 authors from 1 country (Indonesia) with diverse affiliations.

This issue has been available online since 31st October 2020 for the regular issue of Vol 6 No 2 (2020). All articles in this issue (12 original research articles) were authored/co-authored by 34 authors from 1 country (Indonesia) with diverse affiliations.

This issue has been available online since 30th April 2020 for the regular issue of Vol 6 No 1 (2020). All articles in this issue (12 original research articles) were authored/co-authored by 34 authors from 2 countries (Indonesia and Kazakhstan).

This issue has been available online since 31st October 2019 for the regular issue of Vol 5 No 2 (2019). All articles in this issue (12 original research articles) were authored/co-authored by 32 authors from 1 country (Indonesia) with diverse affiliations.

This issue has been available online since 31st October 2019 for the regular issue of Vol 5 No 2 (2019). All articles in this issue (12 original research articles) were authored/co-authored by 35 authors from 3 country (Indonesia, Pakistan, and Australia) with diverse affiliations.

This issue has been available online since 31st October 2020 for the regular issue of Vol 6 No 2 (2020). All articles in this issue (11 original research articles) were authored/co-authored by 34 authors from 1 country (Indonesia) with diverse affiliations.

This issue has been available online since 30th April 2018 for the regular issue of Vol 4 No 1 (2018). All articles in this issue (12 original research articles) were authored/co-authored by 25 authors from 2 country (Indonesia and Japan) with diverse affiliations.