Perplexity.ai has always provided sources and even has filters you can select by clicking the focus button. I dig it for academics as there's an academic filter plus all sources provided I trust such as PubMed, NIH, SemanticScholar, and NCBI. I also really dig there no account needed, unless you want to implement GPT-4. At times I've had to ask for additional details on the answer provided without GPT, but up to this point its still by far my favorite AI to utilize.
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