Many research papers had been published by me.
Many research papers had been published by me.
Many research papers were published by me.
Many research papers were published by me.
Many research papers are published by me.
Many research papers are published by me.
Many research papers have been published by me.
Many research papers have been published by me.
Correct Answer:
Many research papers have been published by me.
Many research papers have been published by me.