Kwok Chi Chim, Florian Luca. Perfect squares representing the number of rational points on elliptic curves over finite field extensions. Finite Fields and Their Applications, 67:101725, 2020. [doi]
@article{ChimL20,
title = {Perfect squares representing the number of rational points on elliptic curves over finite field extensions},
author = {Kwok Chi Chim and Florian Luca},
year = {2020},
doi = {10.1016/j.ffa.2020.101725},
url = {https://doi.org/10.1016/j.ffa.2020.101725},
researchr = {https://researchr.org/publication/ChimL20},
cites = {0},
citedby = {0},
journal = {Finite Fields and Their Applications},
volume = {67},
pages = {101725},
}