| article html file updated | 8 February 2020 02:05 CET | Update | https://www.mdpi.com/2304-6732/4/2/21 |
| article html file updated | 23 September 2019 23:30 CEST | Update | - |
| article html file updated | 4 May 2019 05:21 CEST | Update | - |
| article html file updated | 29 June 2017 12:52 CEST | Update | - |
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| article html file updated | 24 March 2017 22:26 CET | Update | - |
| article html file updated | 24 March 2017 06:39 CET | Original file | - |
| article xml uploaded. | 24 March 2017 06:37 CET | Original file | https://www.mdpi.com/2304-6732/4/2/21/xml |
| article pdf uploaded. | 24 March 2017 06:37 CET | Updated version of record | https://www.mdpi.com/2304-6732/4/2/21/pdf |
| article pdf uploaded. | 23 March 2017 15:49 CET | Version of Record | https://www.mdpi.com/2304-6732/4/2/21/pdf-vor |
