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Evidence for gravitational lensing in IceCube-211208A counterpart PKS 0735 178 - #neutrino lensing proposed: https://academic.oup.com/mnras/article/549/2/stag658/8697604?login=false -> "Gravitational lensing explains why this blazar is detected at this time as a neutrino emitter: a magnification factor of about 10 can move an otherwise sub-threshold neutrino flux above the alert threshold."