If you refer to multiple works where the first author has the same surname, use initials to distinguish between them. This ensures that we do not create confusion about the author. This applies even if the documents are not published the same year.
(J. Bing & Bringsværd, 2004) and (K. Bing, 2000)
Only the first author’s name should have initials, as shown in the example. Here, the reference will be listed under Bing in the reading list, so it is important to avoid confusion.