Darya Frolova, Denis Simakov, Ronen Basri. Accuracy of Spherical Harmonic Approximations for Images of Lambertian Objects under Far and Near Lighting. In Tomás Pajdla, Jiri Matas, editors, Computer Vision - ECCV 2004, 8th European Conference on Computer Vision, Prague, Czech Republic, May 11-14, 2004. Proceedings, Part I. Volume 3021 of Lecture Notes in Computer Science, pages 574-587, Springer, 2004. [doi]