Guàrdia Rúbies J, Bayer i Isant P. A la Recerca de pi. Butll. Soc. Catalana de Mat. [Internet]. 2004 Mar. 24 [cited 2024 May 7];17(2):7–19. Available from: https://revistes.iec.cat/index.php/BSCM/article/view/18332.001