This would make finishing the Ph.D. thesis difficult, though notes show him working on it through 1975.

The scientific work of this trip became his Ph.D. thesis, which he completed in 1884.

She's recently left her consulting job to work on a Ph.D. thesis about popular culture in the 1970's.

She defended her Ph.D. thesis in the area of optical communications.

Within the framework of his Ph.D. thesis he studied the aurora.

The monograph has later been reprinted several times in the form of a Ph.D. thesis.

After this he began research work on his Ph.D. thesis.

The topic of her Ph.D. thesis was a computer program to play chess end games.

In the academic world, it's a given that a Ph.D. thesis isn't a book.

Unfortunately, she was working on her Ph.D. thesis at the time.