Bethe–Salpeter kernel and properties of strange-quark mesons Zhen-Ni Xu, Zhao-Qian Yao, Si-Xue Qin, Zhu-Fang Cui and Craig D. Roberts Eur. Phys. J. A, 59 3 (2023) 39 Published online: 04 March 2023 DOI: 10.1140/epja/s10050-023-00951-7