_ http://en.wikipedia.org/wiki/Bin_packing_problem
_ http://www.cs.arizona.edu/icon/oddsends/bpack/bpack.htm
_ http://en.wikipedia.org/wiki/R-tree
_ http://levitated.net/daily/levBoxFitting.html
_ http://stackulator.com/rtree/
_ http://www.iguanademos.com/Jare/Articles.php?view=RectPlace
_ http://www.jstor.org/pss/2582731