Tetrahedral chains and a curious semigroup: doi:10.17398/2605-5686.34.1.99. Extr. Math. [Internet]. 2019 Jun. 1 [cited 2024 Dec. 22];34(1):99-122. Available from: https://revista-em.unex.es/index.php/EM/article/view/2605-5686.34.1.99