| article html file updated | 8 February 2020 02:02 CET | Update | https://www.mdpi.com/2304-6732/4/2/23 |
| article html file updated | 23 September 2019 23:13 CEST | Update | N/A |
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| article xml uploaded. | 24 March 2017 06:30 CET | Update | https://www.mdpi.com/2304-6732/4/2/23/xml |
| article pdf uploaded. | 24 March 2017 06:30 CET | Updated version of record | https://www.mdpi.com/2304-6732/4/2/23/pdf |
| article pdf uploaded. | 23 March 2017 10:28 CET | Version of Record | https://www.mdpi.com/2304-6732/4/2/23/pdf-vor |