http://web.archive.org/web/20090106125328im_/http://rak.minduploading.org/nibr/comparing-direction-models-10days.png
http://web.archive.org/web/20090106125328/http://netmorph.org/Members/randalk/old-and-new-direction-models
http://web.archive.org/web/20090106125328/http://rak.minduploading.org/nibr/comparing-direction-models-10days.pdf
http://web.archive.org/web/20090106125328/http://rak.minduploading.org/nibr/comparing-direction-models-21days.pdf
http://web.archive.org/web/20090106125328im_/http://rak.minduploading.org/nibr/tension-direction-model-6-pyr-3-int-21-days-20051130.net-with-nibr-demo-20050902.gif
http://web.archive.org/web/20090106125328im_/http://rak.minduploading.org/nibr/tension-direction-model-6-pyr-3-int-21-days-20051130.net.gif
http://web.archive.org/web/20090106122138im_/http://rak.minduploading.org/nibr/main-daughter-and-turn-to-branch.gif
http://web.archive.org/web/20090106122138/http://netmorph.org/Members/randalk/results/main-daughter-and-turn-to-branch