@article{10_37236_1952,
     author = {Yuqin Zhang and Yonghui Fan},
     title = {Packing and covering a unit equilateral triangle with equilateral triangles},
     journal = {The electronic journal of combinatorics},
     year = {2005},
     volume = {12},
     doi = {10.37236/1952},
     zbl = {1083.52005},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1952/}
}