# Any reference paper for the psm tool?

Tool: IR Drop Analysis

Subcategory: Reference materials

## Conversation

### Pzy-ss
Did the psm module refer to any academic research? If so, it would be better to cite the paper for us to learn the ir-solver and make some improvement. If not, any recommendation for freshmen to understand the whole ir-drop thing? Appreciate it!

### vijayank88
@Pzy-ss 
Have you referred [this](https://github.com/The-OpenROAD-Project/OpenROAD/tree/master/src/psm)?
https://theopenroadproject.org/an-ml-based-iccad-contest-for-static-ir-drop-estimation/

### maliberty
@VidyaChhabria is the author - would you comment.

### maliberty
@VidyaChhabria provided the doc in #3405 

### VidyaChhabria
Look at PR: https://github.com/The-OpenROAD-Project/OpenROAD/pull/3428 should update the document to have the citations.