| article html file updated | 7 February 2020 02:33 CET | Update | https://www.mdpi.com/1420-3049/21/1/4 |
| article html file updated | 6 May 2019 04:20 CEST | Update | N/A |
| article html file updated | 26 March 2019 16:59 CET | Update | N/A |
| article html file updated | 12 November 2018 03:55 CET | Original file | N/A |
| article pdf uploaded. | 22 December 2015 18:57 CET | Updated version of record | https://www.mdpi.com/1420-3049/21/1/4/pdf |
| article pdf uploaded. | 22 December 2015 15:32 CET | Updated version of record | N/A |
| article pdf uploaded. | 22 December 2015 12:54 CET | Version of Record | N/A |
| article xml uploaded. | 22 December 2015 12:54 CET | Original file | https://www.mdpi.com/1420-3049/21/1/4/xml |
