@article{articlecab5a65c,
title   = {Estimation of the optical constants and the thickness of thin films using unconstrained optimization},
author = {Birgin, Ernesto Julian Goldberg and Chambouleyron, Ivan and Martínez, José Mário},
year = {1999},
doi = {10.1006/jcph.1999.6224},
journal   = {Journal of Computational Physics}
}