| checkSpelling | Group words with different spellings |
| cleanReferences | Clean cited references in articles |
| combineWords | Associate two words in a single one |
| correctSpelling | Manual correction of word spelling |
| extractTags | Internal function |
| filterArticles | Select only some types of documents |
| getStopwords | Get list of common uninformative words |
| getWords | Get cleaned words |
| groupReferences | Group similar cited references |
| removePunctuation | Remove punctuation characters in citations fields |
| removeWordEndings | Remove words endings |
| removeWords | Remove common uninformative words |
| splitWords | Write a new spelling for associated words |
| toLowercase | Convert all citations fields to lower case |
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