Are there good bounds on the sum of inverse degrees for a graph?

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I'm looking for any literature on the sum $\sum\limits_{v\in V} \frac{1}{\deg(v)}$, but when I look for inverted degree sum, not much comes up about this specifically. I figure that it is either old and common knowledge, or nobody has looked at properties of this sum before. Can you point me in some directions for literature? Books, papers, arXiv articles, and websites are all welcome!