@article{202012.0110,
	doi = {10.20944/preprints202012.0110.v1},
	url = {https://doi.org/10.20944/preprints202012.0110.v1},
	year = 2020,
	month = {December},
	publisher = {Preprints},
	author = {Rashad Abdel-baky and Mohamed Saad},
	title = {Singularities of Non-Developable Ruled Surface with Spacelike Ruling},
	journal = {Preprints}
}