How can I solve the integral below?(adsbygoogle = window.adsbygoogle || []).push({});

## \int_{-\infty}^{\infty} \sqrt{k^2+m^2} e^{izk} dk ##

I thought about contour integration but, as you can see, it doesn't satisfy Jordan's lemma. Also no substitution comes to my mind!

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# Difficult complex integral

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