| article html file updated | 7 February 2020 03:41 CET | Update | https://www.mdpi.com/2304-6732/3/1/6 |
| article html file updated | 6 May 2019 02:06 CEST | Update | N/A |
| article html file updated | 26 March 2019 18:56 CET | Update | N/A |
| article html file updated | 6 April 2016 12:37 CEST | Original file | N/A |
| article xml uploaded. | 21 January 2016 12:02 CET | Original file | https://www.mdpi.com/2304-6732/3/1/6/xml |
| article pdf uploaded. | 21 January 2016 12:02 CET | Version of Record | https://www.mdpi.com/2304-6732/3/1/6/pdf |
