Jan Vrsek. Contour curves and isophotes on rational ruled surfaces. Computer Aided Geometric Design, 65:1-12, 2018. [doi]
@article{Vrsek18, title = {Contour curves and isophotes on rational ruled surfaces}, author = {Jan Vrsek}, year = {2018}, doi = {10.1016/j.cagd.2018.06.006}, url = {https://doi.org/10.1016/j.cagd.2018.06.006}, researchr = {https://researchr.org/publication/Vrsek18}, cites = {0}, citedby = {0}, journal = {Computer Aided Geometric Design}, volume = {65}, pages = {1-12}, }