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How to analysis these MOS transtrators and resistance?

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wjx197733

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This is a bandgap circuit, and there have MOS transtrators M1-M4 that introduce "self-biased", and resistance R1-R3.
My question is: 1. why the MOS introduce "self-biased".
2. what is the roles that resistance R1-R3 play?
 

1. For low Vdd(avoid body effect) and low noise
2. R1: delta Vbe/R1
R2 and R3 for low cascode current bias
 

Hi sunking, can you tell me detail?
 

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