@article{05002939,
title = {Adding layers to bumped-body polyforms with minimum perimeter preserves minimum perimeter.},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {13},
year = {2006},
zbl = {1080.05017},
language = {en},
url = {http://dml.mathdoc.fr/item/05002939}
}
Yang, Winston C. Adding layers to bumped-body polyforms with minimum perimeter preserves minimum perimeter.. The Electronic Journal of Combinatorics [electronic only], Tome 13 (2006) . http://gdmltest.u-ga.fr/item/05002939/