Online text collections deliver more detailed results than the library catalogs.
To find works dedicated to research on an author, do a subject search on the author's name, last name first.
A keyword search on the author's name will find these works, plus works by the author, and sections of more general works.
To find a specific work, search by title. Note: sometimes we have the collected works on an author, but the individual titles are not listed. To find works by an author, do an author search, last name first.