Dense periodic packings of tetrahedra with small repeating units

Authors: 

Yoav Kallus, Veit Elser and Simon Gravel

Discrete Comput. Geom. 44 245-252 (2010).

http://arxiv.org/abs/0910.5226

http://link.springer.com/article/10.1007%2Fs00454-010-9254-3