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The number of different types of articles in the NMU research from 1987 to 2021.
| Rank | Type of documents | Frequency | Percentage (%) |
|---|---|---|---|
| 1 | ARTICLE | 242 | 71.59 |
| 2 | REVIEW | 49 | 14.49 |
| 3 | MEETING ABSTRACT | 34 | 10.06 |
| 4 | EDITORIAL MATERIAL | 9 | 2.63 |
| 5 | BOOK CHAPTER | 4 | 1.18 |
| 6 | CORRECTION | 2 | 0.59 |
| 7 | CONFERENCE PROCEEDINGS | 2 | 0.59 |
| 8 | PUBLISH ONLINE | 1 | 0.29 |
| 9 | NEWS ITEM | 1 | 0.29 |
| 10 | LETTER | 1 | 0.29 |
