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I'm trying to cite someone in a paper I'm writing whose name is "[First-name] de Soya". In my field it's common to cite papers using the "et al." style ("In their seminal paper, de Soya et al. […] present…"), however, "de Soya" is opening the sentence.
In that case, should I write "de Soya et al. […]" or "De Soya et al. […]"