| Option 1 | Option 2 | Option 3 | Crossref | |
|---|---|---|---|---|
| Annual contribution | 250$ | 130$ | not charged | 275$ |
| Pay for DOI | 1$ | 2$ | 5$ | 1$ |
| Individual prefix |  |
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| Free DOI for testing | |
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| Prefix assignment period | 7-10 days | 7-10 days | 7-10 days | 30-45 days |
| Contract with the resident | |
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| Payment in national currency | |
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| Information support | |
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