Detection of Cross-Correlation between Gravitational Lensing and γ Rays. - Ammazzalorso S; Gruen D; Regis M; Camera S; Ando S; Fornengo N; Bechtol K; Bridle SL; Choi A; Eifler TF; Gatti M; MacCrann N; et al. (Physical review letters, 2020)