@article{Zhikharev2015generalization,
author={Zhikharev, L.A.},
title={Generalization to Three-Dimensional Space Fractals of Pythagoras and Koch. Part I},
journal={Geometry & Graphics},
publisher={INFRA-M Academic Publishing LLC.},
year={2015},
pages={24-37},
volume={3},
issue={3},
}