| article html file updated | 6 February 2020 02:06 CET | Update | https://www.mdpi.com/2227-7390/1/2/65 |
| article html file updated | 19 September 2019 20:45 CEST | Update | N/A |
| article html file updated | 8 May 2019 05:11 CEST | Update | N/A |
| article html file updated | 20 March 2019 22:31 CET | Update | N/A |
| article html file updated | 19 December 2016 11:43 CET | Original file | N/A |
| article pdf uploaded. | 15 May 2013 17:00 CEST | Updated version of record | https://www.mdpi.com/2227-7390/1/2/65/pdf |
| article pdf uploaded. | 15 May 2013 16:04 CEST | Version of Record | https://www.mdpi.com/2227-7390/1/2/65/pdf-vor |
