A machine-learning compositional study of exoplanetary material accreted onto five helium-atmosphere white dwarfs with cecilia. - Badenas-Agusti, Mariona; (许偲艺), Siyi Xu; Vanderburg, Andrew; De, Kishalay; Dufour, Patrick; Rogers, Laura K; Hoyos, Susana; Blouin, Simon; Viaña, Javier; Bonsor, Amy; Zuckerman, Ben (Monthly Notices of the Royal Astronomical Society, 2025)