@article{Umbetov2015on,
author={Umbetov, N.. and Dzhanabaev, Z..},
title={On Algorithms of Graphical Plotting of Geodesic Line on a Ruled Surface},
journal={Geometry & Graphics},
publisher={INFRA-M Academic Publishing LLC.},
year={2015},
pages={15-18},
volume={3},
issue={4},
}