| article html file updated | 7 February 2020 04:47 CET | Update | https://www.mdpi.com/2073-4344/6/2/31 |
| article html file updated | 5 May 2019 23:48 CEST | Update | N/A |
| article html file updated | 26 March 2019 21:12 CET | Original file | N/A |
| article pdf uploaded. | 19 February 2016 15:58 CET | Version of Record | https://www.mdpi.com/2073-4344/6/2/31/pdf |
| article xml uploaded. | 19 February 2016 15:58 CET | Original file | https://www.mdpi.com/2073-4344/6/2/31/xml |
