Another #undercited paper is Els Elffers' (2009) 'Interjections: on the margins of language' — a book chapter that's somewhat to find but here's an author copy on RG https://www.researchgate.net/publication/290992820_Interjections_-_on_the_margins_of_language
Nice historical overview of the metatheoretical significance of linguistic thinking about interjections. Google Scholar records <10 cites (2 of which are mine).
Can we make #undercited a thing & use it to boost work that deserves broader recognition?