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Science moves forward by building on the research work of others, so it is important to appropriately cite previous work to acknowledge your sources, underpin your hypothesis, show that you are familiar with the relevant field, and give credit to the work of others, as well as avoid being charged with plagiarism. If you see your scientific paper as the spider in a large web, correct citations will allow readers to get an overview of the main work done previously within the field (the web). References can direct readers to supporting or diverging views and also to sources that may add relevant data to your work.
Cals et al. (Tue,) studied this question.