Since the references can be entered with small variations from one source to the other, it is useful to be able to specify the criteria for when the program should consider two references as duplicates.
- Select Preferences from the EndNote X9-menu
- Under the «Duplicates» category you can choose the boxes to be checked
- Note that it is now possible to avoid duplicates when searching external literature databases. Check «Automatically discard duplicates» to enable this feature.