1.
Zhang Y, Fan Y. Packing and Covering a Unit Equilateral Triangle with Equilateral Triangles. Electron. J. Combin. [Internet]. 2005Oct.25 [cited 2026Mar.27];12(1):R55. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v12i1r55