Per H. Christensen. Adjoints and Importance in Rendering: An Overview. IEEE Trans. Vis. Comput. Graph., 9(3):329-340, 2003. [doi]
@article{Christensen03:0, title = {Adjoints and Importance in Rendering: An Overview}, author = {Per H. Christensen}, year = {2003}, url = {http://computer.org/tvcg/tg2003/v0329abs.htm}, researchr = {https://researchr.org/publication/Christensen03%3A0}, cites = {0}, citedby = {0}, journal = {IEEE Trans. Vis. Comput. Graph.}, volume = {9}, number = {3}, pages = {329-340}, }