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Bradford's Law of Scattering for journals that published articles on Sigma-1 receptor research from 1992 to 2017.
| n | n/N (%) | |
|---|---|---|
| Zone 1 | 11 | 3.6 |
| Zone 2 | 44 | 14.4 |
| Zone 3 | 251 | 82.0 |
Each zone represents about 33% of the total articles (1,102); n, the number of journals in each zone; N, the number of all journals (306).
