See:
https://link.springer.com/article/10.1007/s11038-007-9184-0
https://ntrs.nasa.gov/api/citations/20150021386/downloads/20...
http://lunarnetworks.blogspot.com/2013/05/brightest-impact-r...
The data collected by the "Lunar Reconnaissance Orbiter" can be used to estimate the frequency of impacts.
https://www.lroc.asu.edu/posts/943