Help me! About PSR calculation problems for Bandgap

[jimmyshu]

The two kind bgr circuits and dc psr solutions are shown below. They were refered from papers, but I don't know how to calculate (There were no detailed deduction process in papers). I have no textbooks such as Gray, Allen, Razavi, Baker's books refering to topics about bgr psr calculation (most are about amp's psrr).
I have difficulty in analysing and calculating it. Who can help me analyse it or recommend some easier papers or textbooks about the topics.[/b]

 

[jimmyshu]

There are the papers about bgr psr analysis, but i think they're not detailed enough, and i don't understand how to calculate them. My questions are mainly about dc psr, not including frequence part.
Wish you give me a easy explain.
Thank you!