Question about the Governing equations

[Qianjun-Xia]

Hello,

I'd like to ask how the Angular Momentum function in https://www.cosseratrods.org/cosserat_rods/theory/ is got? Can I find related content in some reference materials?

Thanks!!!

[Qianjun-Xia]

I have solved my question after carefully read the paper again! Thank you so much, I believe this is a very excellent and comprehensive piece of work.