| article html file updated | 9 February 2020 12:09 CET | Update | https://www.mdpi.com/2304-8158/7/4/54 |
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| article xml uploaded. | 1 April 2018 13:30 CEST | Update | https://www.mdpi.com/2304-8158/7/4/54/xml |
| article pdf uploaded. | 1 April 2018 13:30 CEST | Version of Record | https://www.mdpi.com/2304-8158/7/4/54/pdf |