@article{Yoon_2006, title={On the second Gaussian curvature of ruled surfaces in Euclidean $3$-space}, volume={37}, url={https://journals.math.tku.edu.tw/index.php/TKJM/article/view/167}, DOI={10.5556/j.tkjm.37.2006.167}, abstractNote={In this paper, we mainly investigate non developable ruled surface in a 3-dimensional Euclidean space satisfying the equation $K_{II} = KH$ along each ruling, where $K$ is the Gaussian curvature, $H$ is the mean curvature and $K_{II}$ is the second Gaussian curvature.}, number={3}, journal={Tamkang Journal of Mathematics}, author={Yoon, Dae Won}, year={2006}, month={Sep.}, pages={221-226} }