the minor progression

the minor progression ii-v-i, have an extremely popular harmonic movement. for example the V chord in minor is naturally a minor chord, and actually V is dominant in major scale, but in minor V is dominant in ii-v-i progression.
for example : II - V- I

1. Em7b5 - A7 - Dm7 
2. Dm7b5 - G7 - Cm7
3. Gbm7b5 - B7- Em7