What is the notation for the dual field strength in D=11 Five-Brane theory?

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Hello, I am reading the paper "Covariant Action for a D=11 Five-Brane with the Chiral Field".
I don't understand the (\partial a)^2 in the dual field strength \widetilde{F}_{mn}\equiv\frac{1}{\sqrt {(\partial a)^2}}F^*_{mnl}\partial^la(x).
Is it ##\partial_ra\partial^ra##?

Regards.
 
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Yes, I think that could be correct.
 
ok, thank you!
 

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