| article html file updated | 7 February 2020 04:50 CET | Update | https://www.mdpi.com/2076-3417/6/2/60 |
| article html file updated | 5 May 2019 23:43 CEST | Update | N/A |
| article html file updated | 26 March 2019 21:18 CET | Original file | N/A |
| article pdf uploaded. | 22 February 2016 09:58 CET | Version of Record | https://www.mdpi.com/2076-3417/6/2/60/pdf |
| article xml uploaded. | 22 February 2016 09:58 CET | Original file | https://www.mdpi.com/2076-3417/6/2/60/xml |
