How to decrease noise of amplifier?

OP184 is one of the best AD op amps for low noise purposes with single supply configuration. But, 3.9 nV input spectral density and 300nVpp in 0.1 - 10 Hz noise voltage is still too high for nanovolt measurement.
I know paralleling the op amps and lowering amplifier bandwidth can reduce the noise of amplifier effectively, but do you know some other idea for decreasing noise voltage of amplifier?

Thanks,

Saaddin 

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