Two nonlinear optical processes in Z-scan curves of a bleached photographic filmE. Reynoso-Lara, A. Balbuena-Ortega, Y. E. Bravo-García, J. A. Dávila-Pintle, M. L. Arroyo-Carrasco and M. D. Iturbe-CastilloJ. Eur. Opt. Soc.-Rapid Publ., 12 1 (2016) 13DOI: https://doi.org/10.1186/s41476-016-0015-7