Underscore in place of author in references I have recently seen author’s names being replaced with underscores in the references of two different works. For instance in Andrew Wiles’ Modular elliptic curves and Fermat’s last theorem:



In this case Ralph Greenberg is the author of On the structure of certain Galois groups. Why has his name been omitted?
Some citation styles allow you to use a long dash in place of an author name if the work you're citing has the same author as the preceding one. It's stylistic choice.