Why can't I find the code implementation part of this paper in the multiple-camera-calibration module?

[spring-maker]

I am using the kalibr to calibrate my multiple cameras, and it is really useful and robust. I want to explore the algorithms in it. I find a paper called "Self-supervised Calibration for Robotic Systems" being mentioned, but I haven't been able to find the specific code implementation of this paper in the multiple-camera-calibration module. Could you please point it out for me? Forgive my limited skills.