CELL_OPT references

[saner]

As  I  know ,it changes the cell volume ,and according to the change of 
 forces on atoms and geometry displacement ,when it reaches to the *Convergence 
criterium ,then we assume  that  the  corresponding lattice parameter 
 reaches  equilibrium.*

在 2013年3月6日星期三UTC+8下午2时34分20秒，rmrmg写道：
>
> Hello all,
>
> I wonder how cell optimization works. I know how to use this option but I 
> couldn't found explanation how it works.  Is there any paper or other 
> reference which describes theoretical basis of this method?
>
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