The phrase "a paper on a" is correct and usable in written English.
It can be used when referring to a specific topic or subject that a paper discusses or analyzes.
Example: "I am currently writing a paper on a new approach to renewable energy."
Alternatives: "a study about a" or "an article regarding a".
However, there is often more than one way to write a paper on a given research study, depending on how the topic is related to the relevant background literatures.
I was invited to speak at a meeting of the American Psychoanalytic Association — I was to be one of the discussants of a paper on a subject of special interest to me: Freud's dual-instinct theory — and I had to refuse.
At one point, when it became known that I had presented a paper on a subject outside of my research at Stanford, I was even called to the office of the Department Chair for a discussion about my "priorities".
It seemed that English students were as likely to read a paper on a regular basis as their American counterparts, but the difference came when one considered usage of the BBC, primarily the Internet site.
(I wrote a paper on a group that proselytized free love).
Organization Z prepares a paper on a particular state's environmental problems.
Drawings were made by placing a paper on a textured surface — leaves, a wood floor — and rubbing it with graphite.
Some have faulted her for publishing a paper on an item of unknown provenance.
These ef- forts arose from a paper on "an inverted Bohrian model of the atom".
Dr Healy was invited to speak at a symposium and author a paper on an antidepressant called venlafaxine, made by Wyeth.
The award is made in support of research and preparation of a paper on an aspect of wilderness establishment, protection, or management.
