1. “Spontaneous emergence of Josephson junctions in homogeneous rings of single-crystal Sr₂RuO₄”. Yasui Y, Lahabi K, Fernández Becerra V, Fermin R, Anwar MS, Yonezawa S, Terashima T, Milošević MV, Aarts J, Maeno Y, npj Quantum Materials 5, 21 (2020).   http://doi.org/10.1038/S41535-020-0223-7