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How do I develop a bass voice?

I am an 'adult male human' and can sing from A2 to G4 comfortably. It would be great if I can sing up to a whole octave below this. I am in no hurry and am willing to expend time and effort. I just want to know what are the techniques and what amount of work would be involved. Also, I would like to know what is the difference between a false bass and a true bass voice and when to employ which.