Guo Lei. Level crossing curvature and the Laplacian. Image Vision Comput., 6(3):185-188, 1988. [doi]
@article{Lei88, title = {Level crossing curvature and the Laplacian}, author = {Guo Lei}, year = {1988}, doi = {10.1016/0262-8856(88)90025-X}, url = {http://dx.doi.org/10.1016/0262-8856(88)90025-X}, researchr = {https://researchr.org/publication/Lei88}, cites = {0}, citedby = {0}, journal = {Image Vision Comput.}, volume = {6}, number = {3}, pages = {185-188}, }