Cite Bill Gates study

> Sepulveda, N., Jenkins, J., de Sisternes, F., and Lester, R. “The Role of Firm Low-Carbon Electricity Resources in Deep Decarbonization of Power Generation.” Joule 2.11 (2018): 2403-2420.

No file, test, or entry point is named. First locate where project citations or references are maintained, then compare the existing entry with the supplied Sepulveda et al. study citation and confirm the citation appears in the intended place.

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