@article{frengley:congs-of-ell-crv-nonsurj-reps, title = {Congruences of elliptic curves arising from nonsurjective mod {$N$} {G}alois representations}, author = {{Frengley}, Sam}, year = 2023, journal = {Math. Comp.}, volume = 92, number = 339, pages = {409--450}, doi = {10.1090/mcom/3770}, issn = {0025-5718}, url = {https://doi.org/10.1090/mcom/3770}, fjournal = {Mathematics of Computation}, mrclass = {11G05}, mrnumber = 4496970 }