@article{fkt-hdpoc-06,
author = "S.~P.~Fekete and E.~K\"ohler and J.~Teich",
title =  "Higher-dimensional packing with order constraints",
journal = "SIAM Journal on Discrete Mathematics",
year =   "2006",
volume = "20",
number = "4",
pages =   "1056-1078"
}