| Date of inauguration |
since early 1960s, but accessible via Internet in 2004 |
11/2004 |
11/2004 |
|
| Number of journals |
10,969 |
16,500 (>1,200 open access journals) |
not revealed (theoretically all electronic resources) |
|
| Language |
English (plus 45 other languages) |
English (plus more than 30 other languages) |
English (plus any language) |
|
| Subject coverage |
science, social science and arts and humanities |
science and social science |
not revealed |
|
| Period covered |
1900 to present |
1966 to present |
not revealed |
|
| Updating |
weekly |
1–2/week |
monthly |
|
| Developer |
Thompson Scientific (US) |
Elsevier (The Netherlands) |
Google Inc. (US) |
|
| Fee-based |
yes |
yes |
no |
|
| H index calculation |
yes |
yes |
only using Harzing's Publish or Perish software |
