The Uchuu-glam BOSS and eBOSS LRG lightcones: exploring clustering and covariance errors - Ereza, Julia; Prada, Francisco; Klypin, Anatoly; Ishiyama, Tomoaki; Smith, Alex; Baugh, Carlton M; Li, Baojiu; Hernández-Aguayo, César; Ruedas, José (Monthly Notices of the Royal Astronomical Society, 2024)