BLÁZSIK, Zoltán L., BLOKHUIS, Aart, MIKLAVIČ, Štefko, NAGY, Zoltán Lóránt and SZŐNYI, Tamás, 2021, On the balanced upper chromatic number of finite projective planes. Discrete Mathematics [online]. 2021. Vol. 344, no. 3, p. 1–8. [Accessed 9 April 2025]. DOI 10.1016/j.disc.2020.112266. Retrieved from: https://www.sciencedirect.com/science/article/abs/pii/S0012365X20304520?via%3Dihub