Where are all the Large impact Craters on Ceres?

Where are all the Large impact Craters on Ceres?

Where are all the large impact craters on Ceres? July 28, 2016
http://www.nasa.gov/feature/jpl/the-case-of-the-missing-ceres-craters
https://www.middaydaily.com/ceres-huge-impact-craters/25755/
http://www.extremetech.com/extreme/232532-where-are-all-the-large-impact-craters-on-ceres

The paper is:

Marchi, S., A. I. Ermakov, C. A. Raymond, and many others, 2016
The missing large impact craters on Ceres Nature Communications.
vol. 7, Article number: 12257, doi:10.1038/ncomms12257
http://www.nature.com/ncomms/2016/160726/ncomms12257/full/ncomms12257.html

Yours,

Paul H.