remove empty bibliography

content/zettels/differential_pairs.md

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 <https://www.youtube.com/watch?v=QG0Apol-oj0>
 
 > One of the main reasons that differential pairs are used whether is between systems, whether is between boards and a system, or whether is across a circuit board, is so that the circuit will ignore offset in ground.
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-## Bibliography {#bibliography}
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