| article html file updated | 6 February 2020 16:26 CET | Update | https://www.mdpi.com/2304-6732/2/1/270 |
| article html file updated | 7 May 2019 00:06 CEST | Update | N/A |
| article html file updated | 25 March 2019 22:40 CET | Original file | N/A |
| article pdf uploaded. | 9 March 2015 14:23 CET | Version of Record | https://www.mdpi.com/2304-6732/2/1/270/pdf |
