Zeros of the Bessel's function $J_0(z)$

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I am particularly interested in finding a form for the zeros of the Bessel's function $J_0(z)$. I have read somewhere that it has infinite number of zeros (need reference for this). But, in order to study their properties, I need to know some form of them (if such a form exists). Can anyone help? I am also keen to go through the existing literature on this topic if any exists.