Absorption edge and the refractive index dispersion of carbon-nickel composite films at different annealing temperaturesVali Dalouji, Seyed Mohammad Elahi, Shahram Solaymani and Atefeh GhaderiEur. Phys. J. Plus, 131 4 (2016) 84DOI: https://doi.org/10.1140/epjp/i2016-16084-8