Find link reference in Excel

I hope someone can help me with my issue.

Every time I start I get a notifciation to update external links. The two links listed are to two seperate spreadsheets.

I already searched the sheet and the workbook with *.xl* but no result. I've checked the Name Manager as well as all macros. 

Is there another way to find out where the link refernce is been used?

Thanks for your help.