IEEE Referencing queries

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Hello all, I have some very basic quesries regarding the use of the IEEE referencing systems (sorry...).

1) If you have two or more sentances where you cite from a paper do you need to add a [1] or what ever number, to all the sentances? What if you have a whole papagraph based on that one paper?

2) Am I right in saying that the reference label needs to be inserted before the end of the setance e.g.

Joe bloggs did this [2].

If so does this mean that [2] no longer applies to any other senstance?

Thanks, hope you are all doing well :-)

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