V. Carvalho, C. da Silva, and O. Lee.
" Linial's Dual Conjecture for Path-Spine Digraphs", in <em>Anais do V Encontro de Teoria da Computação</em>, Cuiabá, 2020, pp. 93-96, doi: <a href="https://doi.org/10.5753/etc.2020.11098">https://doi.org/10.5753/etc.2020.11098</a>.