@article{DAN_1971_200_3_a16,
     author = {S. G. Il'ina},
     title = {Exact formulas for the determination of optic constants $n$ and $\kappa$ based on the reflection},
     journal = {Doklady Akademii Nauk},
     pages = {568--570},
     publisher = {mathdoc},
     volume = {200},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_200_3_a16/}
}