[Wien] Formula to calculate lattice constant from cubic volume

[Naseem Hassan]

Dear Members

I saw a formula to calculate lattice constant from cubic volume but was not
able to locate its reference or derivation. The formula is

Lattice constant = 0.529116(4×volume)^0.3333

I know it might be easiest question to be asked here at this level but
unfortunately could not find derivation. How you guys will encourage.
Thank you
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