@article{Melnyk2014zero,
author={Melnyk, O.. and Buda, A..},
title={Zero Control as Integral Part of Geometrical and Graphic Disciplines’ Instruction Technique},
journal={Geometry & Graphics},
publisher={INFRA-M Academic Publishing LLC.},
year={2014},
pages={32-36},
volume={2},
issue={2},
}