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You must have heard how those samples were used. I'm not sure sampling a single note or vocal stab kinda thing counts as "sampling disco".
When I think of sampling disco I think of filtered disco loops like Beltram did or maybe something like Slam's Clap Your Hands w/ the Stevie Wonder vocal. I need to find better examples but that's all I can think of right now. Ben Sims plays a lot of newer stuff with filtered disco loops but no idea of individual tracks.
Tracks that Mills sampled that spring to mind are Richie Havens and Michael Jackson