Checks span from preprints reviewed before formal publication to works checked decades after: 37% precede formal publication, 48% follow within 6 months, and some reproduce work published over 38 years earlier. (2 certificates excluded for missing a date)
| Publisher | Venues | Certificates |
|---|---|---|
| AGILE (Association of Geographic Information Laboratories in Europe) | 1 | 73 |
| Elsevier | 1 | 1 |
| GigaScience Press | 2 | 3 |
| Springer | 1 | 2 |
| University of Maine | 1 | 2 |
| unknown | 7 | 51 |