Until additional sources are found, you can export the article with full history and back it up somewhere public and immutable (e.g. github, pastebin), so that

Until additional sources are found, you can export the article with full history and back it up somewhere public and immutable (e.g. github, pastebin), so that the content isn't forever lost when the article is deleted. Include the original license. Perhaps there are other, subject-specific wikis where this content would be considered welcome and notable.