S. Sengupta. "Iteration of polynomials over Z." ProQuest. See the homepage for the link.
S. Sengupta. "Nilpotent polynomials over Z.” Submitted to International Journal of Number Theory. Here is the Arxiv link.
S. Sengupta. "Locally nilpotent, non nilpotent polynomials over arbitrary rings of integers." In preparation.
S. Sengupta. "Locally nilpotent polynomials over Z." INTEGERS, 24 (2024), A13. One can access it here.