PYTHAGORAS TREE [online], melxised.tripod.com [dostęp 2017-06-12].
uni-stuttgart.de
visus.uni-stuttgart.de
F. Beck, M. Burch, T. Munz, L. Di Silvestro, D. Weiskopf Generalized Pythagoras Trees: A Fractal Approach to Hierarchy Visualization, [w:] Battiato S., Coquillart S., Pettré J., Laramee R., Kerren A., Braz J. (eds) Computer Vision, Imaging and Computer Graphics – Theory and Applications. Communications in Computer and Information Science, vol 550. Springer, Cham, 2015.
web.archive.org
Fraktale... spod ołówka [online], zobaczycmatematyke.pl [dostęp 2017-06-16] [zarchiwizowane z adresu 2018-02-07](pol.).
