2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/137158This paper comments on the recently reported quantum oscillations in underdoped YBCO crystals. The implications to other experiments and some hurdles to validating the proposed interpretation are discussed.5 pages, no figures. DDW and SDW differentiated and minor corrections and acknowledgments addedStrongly Correlated ElectronsSuperconductivitytext