@article{oai:repository.dl.itc.u-tokyo.ac.jp:00000842, author = {Nakajima, Teruyuki and King, Michael D.}, issue = {36}, journal = {Applied optics}, month = {Dec}, pages = {7669--7683}, title = {Asymptotic theory for optically thick layers : application to the discrete ordinates method}, volume = {31}, year = {1992} }