M. Benedito, L. Pedrosa, and H. Rosado.
"A Constant-Factor Approximation for the Generalized Cable-Trench Problem", in <em>Anais do IV Encontro de Teoria da Computação</em>, Belém, 2019, doi: <a href="https://doi.org/10.5753/etc.2019.6399">https://doi.org/10.5753/etc.2019.6399</a>.