(Pre-analysis) (ebook/docx) Remove reference in book.

In many book is possible to find link to reference, but the reading of those numbers or phrase is not natural in a lecture section.

In all scripts exist a method used to extract chapter text, the analysis required here need to take this text as input and remove possible reference.
Most of times a reference Is defined with following syntax `[1]` where 1 is the reference.
Reference examples:
- [1]
- (Author, 1999)
- phrase.1

Desiderable: add an optional flag to remove the references from text.