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To cover the case of readers with no back button you need to include links back to multiple references. If they are in different chapters the end of chapter notes can be used effectively but not within a chapter or if end notes at the end of the book are used. ePub does not support dynamic links so it is not possible to have a smart back link within the text of a book. Thus the best solution is to provide a back link at the start of the note and if two are needed then there is is no better solution than just providing two backlinks with some text that identifies which one the user should use. It should not be something like link 1 and 2 since the user may not know which link they should follow, since they may not have chosen to follow the first link and would have no idea that they are now at the 2nd one. A chapter indication or a unique text reference from the original should be used. It could be a number but it should be the one that was used in the original reference and must be unique.
Dale
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