@article{frengley-laird:ptors,
  title         = {Modular abelian surfaces of small conductor with nontrivial Tate--Shafarevich groups},
  author        = {{Frengley}, Sam and {Laird}, Dylan},
  journal       = {arXiv e-prints},
  year          = 2026,
  pages         = {arXiv:2602.19813},
  url           = {https://arxiv.org/abs/2602.19813}
}