K. Lima, R. Figueiredo, E. Martins, and J. Schmith.
"Virtual lines for offside situations analysis in football", in <em>Anais Estendidos da XXXIV Conference on Graphics, Patterns and Images</em>, Online, 2021, pp. 189-194, doi: <a href="https://doi.org/10.5753/sibgrapi.est.2021.20037">https://doi.org/10.5753/sibgrapi.est.2021.20037</a>.