Just use "and" instead of the comma. The comma is only used to change the ordering of the authors
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author = {A. Dhooge and W. Govaerts and Yu. A. Kuznetsov and
W. Mestrom and A. M. Riet and B. Sautois},
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# custom selection of integrations to work with core
pip install llama-index-core
pip install llama-index-llms-openai
pip install llama-index-llms-replicate
pip install llama-index-embeddings-huggingface